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Ginger lemon water kefir
Level 1 · beginner
Strained water kefir with crushed ginger slices and lemon rounds, in bottles made for fizz. Spicy, tart and medium fizzy.
- Time
- 24–48h
- Temperature
- 68–77°F
- Bottles
- 1L
The golden rule: the drink already sour before it is bottled, bottles made for pressure, and never more than 48 h out of the fridge.
No sign-up. We guide you step by step, from the scale to the fridge.
Reviewed October 26, 2026 · 24 facts, each with its source
Before you start
This is the second fermentation of water kefir. Strained kefir, with the grains out, goes into bottles with ginger and lemon and sits out of the fridge for a day or two to build fizz. Ginger and water kefir go well together: in Eastern Africa and rural Greece, ginger beer is made with these same grains. In the sealed bottle, the yeast keeps eating the sugar left in the kefir: it makes gas, and alcohol too. The base recipe moves it to the fridge as soon as you strain it, as BCCDC asks. Leaving it out is a house rule, with limits: bottles made for fizz, 48 hours at most, and two days to drink it.
You'll need
- One 500 ml swing-top glass bottle, made for carbonated drinks
- One 500 ml PET soda bottle, the test bottle
- 1-liter glass pitcher
- Knife and cutting board
- Plastic funnel
- Plastic strainer
- Calibrated pH meter
- Kitchen scale
Step by step
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Wash and sanitize the bottles
Wash the bottles, the cap, the pitcher, the knife, the cutting board, the funnel and the strainer with hot, soapy water and rinse them well. Sanitize the glass bottle with its gasket, the pitcher and the strainer by submerging them in water at 171 °F or hotter for at least 30 seconds. Only wash and rinse the PET bottle: water that hot warps it. The same goes for the funnel if its plastic can't take the heat.
Tip: A soda or sparkling water bottle works as the test bottle: it's made to hold pressure.
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Check the pH of the strained kefir
Use freshly strained water kefir, the batch you were about to refrigerate: no grains, and without the figs and lemon from the base. Check the pH with the calibrated meter: it must be 4.6 or below. If it reads higher, don't bottle it.
Tip: Don't add sugar: what's left in the kefir is enough for the fizz.
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Slice the ginger and the lemon
Wash and peel the ginger and cut it into ⅛–¼-inch (3–5 mm) slices: 15 g. Crush them a little with the flat of the knife so they release their juice. Wash the lemon under running water and cut it into thin rounds, about 40 g, without the seeds.
Tip: Sliced ginger strains out easily and leaves the kefir clean. For more heat, grate it instead.
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Mix, test again and bottle
Put the kefir, ginger and lemon in the pitcher and stir. Check the pH again: it must still be 4.6 or below. The lemon brings it down a little. Split the ginger and lemon between the two bottles and fill them with kefir through the funnel. Leave 1¼–2 inches (3–5 cm) of air at the top and close them.
Tip: Write the date and time on both bottles: the 48 hours start now.
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Leave them out of the fridge for 24 to 48 hours
Keep them in the kitchen at 68–77 °F, out of direct sun. Every 12 hours, squeeze the test bottle. Once it's as hard as an unopened soda, move both bottles to the fridge, even if 24 hours haven't passed. Even if it's still soft, they go in the fridge at 48 hours: that's a house rule.
Expect medium fizz: ginger and lemon bring hardly any sugar, so the bubbles come from what's left in the kefir. It stays cloudy and pale, and the ginger gets spicier the longer it sits. If you see green, blue, brown or black mold, or it smells rotten, throw it out.
Tip: Rather not watch the clock? Do the second fermentation in the fridge, for at least 24 hours, as BCCDC does. It's slower and makes less fizz.
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Move them to the fridge and drink it within 2 days
Keep the bottles in the fridge at 40 °F or below, and drink it within 2 days: that's a house rule, the same one the guidelines give for kombucha with fruit. Open it cold, after a few hours in the fridge: slowly, over the sink, with a towel on top and pointed away from your face. Pour it through the strainer to catch the ginger and lemon.
Tip: Don't shake the bottle before opening it.
No sign-up. We guide you step by step, from the scale to the fridge.
Variations
The same method, a different flavor. Once you have this one down, try one of these.
How to tell it's going well
- Only with acidic, strained kefir. Bottle only kefir with the grains out and a pH of 4.6 or below, and test again once the ginger and lemon are in.
- Bottles made for fizz, plus a PET test bottle. Swing-top or beer glass bottles, or PET soda bottles. Never jars or wine, oil or still water bottles: gas builds up, and the liquid can push out or the bottle can break. Squeeze the test bottle every 12 hours.
- Never more than 48 hours out of the fridge, and never above 77 °F. These are house rules. BCCDC does this second fermentation inside the fridge: that's the most cautious option.
- Open it cold, slowly and away from your face. In Australia, a kombucha was recalled because the cap could pop off and injure.
- It has more alcohol than the kefir you started with, and it keeps gaining it in the fridge. It's not for young children or during pregnancy.
- Drink it within 2 days. That's a house rule for kefir with fruit.
- Pasteurized juice only. If you swap the lemon for juice, make it pasteurized.
Where every number comes from
Every number in this recipe comes from a food safety guide. We keep a copy of each source and quote its exact words.
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1
BCCDC does the second fermentation with fruit, lemon included, once the grains are out and inside the fridge, for at least 24 hours
“Secondary fermentation steps that add additional fruit or fruit juices, for example, apple, pineapple, lime, lemon, mango, cherries, or strawberries occur after grain removal and should be performed in the refrigerator for at least 24 hrs.”
BC Centre for Disease Control, Environmental Health Services · Safety of Fermented Foods, Section 3.12: Kefir, milk and water (December 2024) · read on October 25, 2026
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2
BCCDC cools strained kefir to 40 °F within 4 hours at most
“Cool to 4oC immediately, within 4 hrs (no longer than 6 hrs)”
BC Centre for Disease Control, Environmental Health Services · Safety of Fermented Foods, Section 3.12: Kefir, milk and water (December 2024) · read on October 25, 2026
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3
In Eastern Africa and rural Greece, ginger beer is made with water kefir grains
“Ginger beer. This is a popular beverage in Eastern Africa and rural Greece, made from ginger fermented with water kefir grains”
BC Centre for Disease Control, Environmental Health Services · Safety of Fermented Foods, Section 3.12: Kefir, milk and water (December 2024) · read on October 25, 2026
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4
Lemon slices lower the pH of water kefir
“Reduce pH by adding citric acid (lemon slices) or equivalent to lower pH.”
BC Centre for Disease Control, Environmental Health Services · Safety of Fermented Foods, Section 3.12: Kefir, milk and water (December 2024) · read on October 25, 2026
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5
Final pH 4.6 or below, and never below 2.5
“Ensure the pH of final product is 4.6 or less, but not lower than pH of 2.5.”
BC Centre for Disease Control, Environmental Health Services · Safety of Fermented Foods, Section 3.12: Kefir, milk and water (December 2024) · read on October 25, 2026
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6
Sanitize the strainer before each use
“Sanitize sieves before each use.”
BC Centre for Disease Control, Environmental Health Services · Safety of Fermented Foods, Section 3.12: Kefir, milk and water (December 2024) · read on October 25, 2026
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7
Built-up gas can push the liquid out
“Excess pressure can build-up from carbon dioxide, causing fluids to leak out.”
BC Centre for Disease Control, Environmental Health Services · Safety of Fermented Foods, Section 3.12: Kefir, milk and water (December 2024) · read on October 25, 2026
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8
Water kefir has a live culture and needs refrigeration
“Water kefir contains live culture and requires refrigeration.”
BC Centre for Disease Control, Environmental Health Services · Safety of Fermented Foods, Section 3.12: Kefir, milk and water (December 2024) · read on October 25, 2026
Show the remaining 16 claims
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9
Once finished, into the fridge at 40 °F
“Once kefir production is deemed complete, it must be refrigerated at 4°C.”
BC Centre for Disease Control, Environmental Health Services · Safety of Fermented Foods, Section 3.12: Kefir, milk and water (December 2024) · read on October 25, 2026
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10
Recommended labels, "Do not shake." and "Contents under pressure."
“Precautionary statements on bottles are recommended to advise consumers “Do not shake.” and “Contents under pressure.””
BC Centre for Disease Control, Environmental Health Services · Safety of Fermented Foods, Section 3.12: Kefir, milk and water (December 2024) · read on October 25, 2026
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11
It may contain alcohol, so it's not for young children or during pregnancy
“May contain alcohol. Not a suitable beverage for young children or during pregnancy.”
BC Centre for Disease Control, Environmental Health Services · Safety of Fermented Foods, Section 3.12: Kefir, milk and water (December 2024) · read on October 25, 2026
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12
Pasteurized juice only
“Only use pasteurized milk and juice for fermentation media.”
BC Centre for Disease Control, Environmental Health Services · Safety of Fermented Foods, Section 3.12: Kefir, milk and water (December 2024) · read on October 25, 2026
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13
Ginger peeled, cut into 3–5 mm slices and well crushed (school ginger beer guide, practice)
“Peel the ginger and cut it into slices 3–5 mm thick. Bruise the slices well”
Science in School (EIROforum), Dean Madden, National Centre for Biotechnology Education, University of Reading · Ginger beer: a traditional fermented low-alcohol drink (Issue 8, Spring 2008) · read on October 25, 2026
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14
Leave 3–5 cm of air at the top (school ginger beer guide, practice)
“leaving a 3–5 cm air gap at the top”
Science in School (EIROforum), Dean Madden, National Centre for Biotechnology Education, University of Reading · Ginger beer: a traditional fermented low-alcohol drink (Issue 8, Spring 2008) · read on October 25, 2026
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15
Sanitize in water at 171 °F or hotter for 30 seconds
“Submerge cleaned equipment in hot water (at least 171°F) for at least 30 seconds to sanitize.”
National Center for Home Food Preservation (USDA, University of Georgia) · Kombucha Tea · read on October 20, 2026
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16
Herbs and fruit are washed and handled so they don't contaminate the drink (BCCDC guidance for kombucha and jun)
“Other products added to change flavour (herbs, fruit, etc.) must be processed and handled in a manner that prevents contamination of the kombucha or jun, including washing and refrigeration where appropriate.”
BC Centre for Disease Control, Environmental Health Services · Safety of Fermented Foods, Section 3.11: Kombucha and Jun (September 2023, updated December 2024) · read on October 25, 2026
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17
Bottles that resist acid and pressure (BCCDC guidance for kombucha and jun)
“Glass bottles, cans or kegs should be resistant to acid leaching and pressure build-up.”
BC Centre for Disease Control, Environmental Health Services · Safety of Fermented Foods, Section 3.11: Kombucha and Jun (September 2023, updated December 2024) · read on October 25, 2026
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18
With too much gas, bottles and cans can rupture
“Excess formation of gas in bottles and cans may cause containers to rupture under added pressure.”
BC Centre for Disease Control, Environmental Health Services · Safety of Fermented Foods, Section 3.11: Kombucha and Jun (September 2023, updated December 2024) · read on October 25, 2026
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19
In warm weather, no long second fermentations
“A prolonged second fermentation period when temperatures are warm should be avoided.”
BC Centre for Disease Control, Environmental Health Services · Safety of Fermented Foods, Section 3.11: Kombucha and Jun (September 2023, updated December 2024) · read on October 25, 2026
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20
In kombucha and jun, added sugar and flavorings can produce excess alcohol
“Sugars and flavourings with added sugar added after this second step may cause formation of excess alcohol if fermentation persists.”
BC Centre for Disease Control, Environmental Health Services · Safety of Fermented Foods, Section 3.11: Kombucha and Jun (September 2023, updated December 2024) · read on October 25, 2026
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21
Mold is usually green, blue, brown or black
“Mold is typically green, blue, brown, or black in color.”
UC Davis, Department of Food Science and Technology · Common issues with fermented fruits and vegetables (v1.0, 15-mar-2022) · read on October 20, 2026
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22
Once flavored, 2 days in the fridge (the figure for kombucha, which we use here too)
“Once flavors have been added kombucha should be stored under refrigeration and consumed within 2 days.”
University of Georgia Cooperative Extension (National Center for Home Food Preservation) · Crafting Kombucha at Home: Frequently Asked Questions (2026) · read on October 20, 2026
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23
A kombucha recalled because the cap could pop off and injure
“This product may cause injury due to cap popping off.”
NSW Food Authority · Recall: LoBros Lemon Lime and Bitters Kombucha, high pressure, cap may pop off (27 Feb 2019) · read on October 25, 2026
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24
In sealed bottles, a kombucha reached 1.6–1.7% alcohol after 30 days in the fridge
“After refrigeration for 30 days at 4 °C, ethanol content changed significantly (p < 0.05) in all samples and reached values of 13.41 ± 0.09, 13.10 ± 0.31, 12.84 ± 0.15 g/L or 1.70 ± 0.01, 1.66 ± 0.04, 1.61 ± 0.02% (v/v)”
Foods (MDPI), via PubMed Central · Kombucha Fermentation of Olympus Mountain Tea (Sideritis scardica) Sweetened with Thyme Honey (2023) · read on October 25, 2026
