How to Make Water Kefir at Home in 10 Minutes: A Step-by-Step Guide

 

Making water kefir requires only 10 minutes of active work, and in 48–72 hours, your refreshing, live-culture probiotic drink is ready. In this guide, we'll show you step-by-step how to make it at home using Japanese Crystal Mushroom.

 

What Will You Need?

 

Ingredients (for approx. 3 liters of drink):

• 200g of fresh Japanese Crystal Mushroom (water kefir grains)
• 3 liters of filtered water (chlorine-free!)
• 300g of white sugar
• 1 handful of organic raisins (unsulphured)
• 1 organic lemon

Equipment:

• 5-liter glass jar
• Plastic sieve (NOT metal!)
• Plastic or wooden mixing spoon
• A clean kitchen towel or a small plate to cover it
• Glass bottles for the finished drink

⚠️ Never use metal utensils with your Japanese Crystal Mushroom — the metal can damage the live culture.

 

Step-by-Step Guide

 

Step 1: Rinse the Grains (1 minute)

Pour the newly arrived Japanese Crystal Mushroom into a plastic sieve and gently rinse them with filtered water. Never use tap water — the chlorine can kill the beneficial bacteria.

Step 2: Prepare the Sugar Water (3 minutes)

In a 5-liter jar, dissolve 300g of sugar in 3 liters of filtered water. Mix well until the sugar has completely dissolved. (Don't worry about the sugar — the grains will consume it during fermentation!)

Step 3: Add the Grains and Other Ingredients (2 minutes)

Place the rinsed crystal mushroom grains into the jar, add a handful of organic raisins, and one sliced organic lemon (with the peel). Cover it with a clean kitchen towel or a small plate. Do not seal it tightly, as the grains produce carbon dioxide that needs to escape.

Step 4: Let it Ferment (48–72 hours)

Place the jar in a spot at room temperature, away from direct sunlight. Stir it once a day with a wooden or plastic spoon. After 48–72 hours, your drink is ready — the longer it sits, the tarter and fizzier it will become.

Step 5: Strain and Bottle (4 minutes)

Strain the drink using a plastic sieve, squeeze the juice from the lemon slices into it, and pour it into glass bottles. ⚠️ Do NOT seal the caps tightly — the ongoing fermentation can create pressure!

Put it in the fridge, wait for it to cool, and enjoy! 🥂

 

What to Do with the Grains for the Next Batch?

 

You can reuse the strained grains — you can repeat the same process for weeks. If you want to give them a rest, put them in sugar water and store them in the fridge (for a maximum of 1–2 weeks).

 

Common Mistakes to Avoid

 

❌ Using raisins preserved with sulfur dioxide — the sulfur dioxide will destroy the culture

❌ Metal utensils — use only plastic or wooden sieves, spoons, and lids

❌ Sealing bottles too tightly — risk of explosion

❌ Environment is too warm — above 28°C the grains can get overactive

❌ Cold pantry — fermentation stops below 18°C

 

How Much Water Kefir Should You Drink Daily?

 

For beginners, a daily amount of 100–200 ml is recommended, gradually increasing to 300–500 ml. Consuming too much at once may cause temporary digestive reactions as your gut flora adapts.

 

Are You Ready?

 

If you don't have your crystal mushroom grains yet, order 200g of fresh, premium crystal mushroom directly from the producer, or choose the complete starter kit — with all the tools and ingredients you'll need!

 

Also read: What is Japanese Crystal Mushroom? — everything you need to know about water kefir.