Why You’ll Love This Recipe

I love homemade water kefir because the basic process requires only a few ingredients. Once I have active water kefir grains, I can use them repeatedly to make new batches.

I also like how much control I have over the final drink. I can keep the first fermentation simple, then use a second fermentation with fruit or juice when I want stronger flavor and more carbonation.

Ingredients

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

Water kefir grains
Filtered or dechlorinated water
Granulated cane sugar
Dried fruit, such as an unsulfured fig or a few raisins, optional
Lemon slice, optional
Fruit juice or chopped fruit for a second fermentation, optional

Directions

1. Prepare the Sugar Water

I dissolve the sugar in a small amount of warm water in a clean glass jar. Once the sugar has dissolved, I add the remaining cool water.

Before adding my water kefir grains, I make sure the sugar water has cooled to room temperature. I don’t add the grains to hot water because excessive heat can damage them.

2. Add the Water Kefir Grains

I add the water kefir grains to the cooled sugar water. If desired, I also add a piece of unsulfured dried fruit or a slice of lemon.

I cover the jar with a breathable cloth or coffee filter and secure it with a rubber band. This keeps debris out while allowing gases produced during fermentation to escape.

3. Let It Ferment

I leave the jar at room temperature away from direct sunlight for about 24 to 48 hours. The exact fermentation time can vary depending on room temperature and the activity of my grains.

I usually notice that the finished water kefir tastes less sweet and slightly tangy. I avoid letting every batch ferment indefinitely, since the grains need enough available sugar to remain active.

4. Strain the Water Kefir

Once I like the flavor, I remove any fruit or lemon and strain the liquid through a clean non-reactive strainer. I save the water kefir grains for my next batch.

At this stage, I can drink the water kefir as it is or proceed with a second fermentation.

5. Add Flavor

For flavored water kefir, I transfer the strained drink to a pressure-safe fermentation bottle and add a small amount of fruit juice, chopped fruit, ginger, or another preferred flavoring.

I leave appropriate headspace in the bottle and seal it.

6. Second Fermentation

I let the sealed bottle ferment at room temperature for roughly 12 to 24 hours before refrigerating it. Carbonation can build quickly, so I monitor the bottles carefully rather than relying only on a fixed fermentation time.

Once the flavor and carbonation are where I want them, I refrigerate the water kefir thoroughly before opening. I open fermented bottles slowly and carefully because pressure can build inside them.

Servings and Timing

A typical home batch makes approximately 4 servings, depending on the size of each glass.

Prep time: about 10 minutes
First fermentation: 24–48 hours
Optional second fermentation: about 12–24 hours
Total time: approximately 1½–3 days
Servings: about 4

Fermentation speed depends on factors such as room temperature, the amount and activity of my kefir grains, and the sugar concentration, so I use these times as guidelines rather than strict deadlines.

Variations

Lemon Ginger Water Kefir

I add fresh ginger and a little lemon juice during the second fermentation. I love this combination because it creates a bright, slightly spicy drink.

Berry Water Kefir

I add crushed strawberries, raspberries, blueberries, or blackberries during the second fermentation. I strain out the fruit before drinking if I want a smoother beverage.

Orange Water Kefir

I flavor the finished first fermentation with orange juice. I find that its natural sweetness works particularly well when I want a fruitier drink.

Pineapple Water Kefir

I add a little pineapple juice or chopped pineapple for the second fermentation. I monitor this version closely because additional fruit sugars can contribute to active carbonation.

Mint and Lime Water Kefir

I add fresh mint and lime for a particularly refreshing variation. I like serving this version thoroughly chilled.

Storage/Reheating

Once fermentation has reached the point I want, I store my finished water kefir in the refrigerator. Cold temperatures slow fermentation, although they don’t necessarily stop it completely.

I generally aim to drink homemade water kefir within about 1 to 2 weeks for the best flavor and quality. I keep carbonated batches in suitable bottles and open them cautiously because pressure may continue to develop during storage.

I don’t reheat water kefir. I serve it cold, and I keep finished batches refrigerated rather than storing sealed fermented bottles at room temperature for extended periods.

FAQs

What are water kefir grains?

Water kefir grains are cultures containing communities of bacteria and yeasts in a polysaccharide matrix. Despite their name, they aren’t cereal grains. I use them to ferment sugar water, then strain and reuse them for future batches.

How do I know when my water kefir is ready?

I taste a small amount after about 24 hours. When it has become less sugary and has developed a pleasantly tangy fermented flavor, I consider the first fermentation ready. I let it ferment longer when I want a less-sweet result, while keeping an eye on the health and activity of my grains.

Can I use tap water to make water kefir?

I prefer filtered or dechlorinated water because heavily chlorinated water may interfere with the microbial culture. If my tap water is suitable for fermentation and isn’t heavily treated, it may work, but I avoid distilled water as my default because water kefir grains also benefit from minerals.

Why isn’t my water kefir fizzy?

The first fermentation isn’t always highly carbonated because I usually cover it with a breathable material. When I want more fizz, I use a second fermentation in an appropriate pressure-safe bottle with a little fruit or juice. I remember that carbonation creates pressure, so I handle sealed bottles carefully.

Can water kefir go bad?

Yes. I pay attention to unusual colors, visible fuzzy mold, putrid or otherwise clearly unpleasant odors, and other obvious signs of contamination. If I suspect mold or spoilage, I discard the batch rather than tasting it. I also keep my jars, strainers, bottles, and hands clean throughout the process.

Conclusion

Making Water Kefir at home is a fermentation project I enjoy because one basic method gives me plenty of possibilities. I start with water kefir grains, sugar, and water, allow the mixture to ferment, and then either drink it plain or give it additional flavor and carbonation through a second fermentation.

How to Make Water Kefir

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A lightly fizzy fermented drink made with reusable water kefir grains, sugar, and water. Enjoy it plain or add fruit, citrus, ginger, or herbs during a second fermentation for extra flavor and carbonation.

Author: Laura
Prep Time: 10 minutes
Cook Time: 36-72 hours fermentation
Total Time: 1.5-3 days
Yield: 4 servings
Category: Beverage
Method: Fermentation
Cuisine: International
Diet: Vegan

Ingredients

Water kefir grains
Filtered or dechlorinated water
Granulated cane sugar
Dried fruit, such as an unsulfured fig or a few raisins, optional
Lemon slice, optional
Fruit juice or chopped fruit for a second fermentation, optional

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Instructions

Dissolve the granulated cane sugar in a small amount of warm water in a clean glass jar. Add the remaining cool water and allow the mixture to reach room temperature before adding the kefir grains.
Add the water kefir grains to the cooled sugar water. Add unsulfured dried fruit or a lemon slice if desired. Cover the jar with a breathable cloth or coffee filter and secure it with a rubber band.
Ferment at room temperature away from direct sunlight for 24 to 48 hours. Begin tasting after about 24 hours and continue fermenting until the drink is less sweet and pleasantly tangy.
Remove any dried fruit or lemon and strain the water kefir through a clean non-reactive strainer. Reserve the grains for another batch.
Drink the strained water kefir immediately or transfer it to a pressure-safe fermentation bottle for a second fermentation. Add a small amount of fruit juice, chopped fruit, ginger, or another desired flavoring, leaving appropriate headspace before sealing.
For additional carbonation, ferment the sealed bottle at room temperature for approximately 12 to 24 hours, monitoring it carefully as pressure can build quickly.
Once the desired flavor and carbonation are reached, refrigerate the water kefir thoroughly. Open the chilled bottle slowly and carefully to release pressure before serving.

Notes

Never add water kefir grains to hot sugar water, as excessive heat can damage the culture.
Use filtered or dechlorinated water when possible and avoid distilled water as the default because water kefir grains benefit from minerals.
Fermentation speed varies with room temperature, sugar concentration, and the activity of the kefir grains.
For flavored water kefir, try lemon and ginger, berries, orange, pineapple, or mint and lime during the second fermentation.
Use bottles designed to safely withstand fermentation pressure for sealed second fermentation. Carbonation can build quickly, especially when fruit or juice is added.
Refrigerate finished water kefir and consume it within about 1 to 2 weeks for best quality. Pressure may continue to develop during refrigerated storage, so open carbonated bottles cautiously.
Keep hands, jars, strainers, and bottles clean. Discard the batch without tasting if you observe fuzzy mold, unusual colors, putrid odors, or other clear signs of spoilage.

Nutrition

Serving Size: 1 glass
Calories: 35 kcal
Sugar: 7 g
Sodium: 10 mg
Fat: 0 g
Saturated Fat: 0 g
Unsaturated Fat: 0 g
Trans Fat: 0 g
Carbohydrates: 8 g
Fiber: 0 g
Protein: 0 g
Cholesterol: 0 mg