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Homemade Kefir

A tangy, probiotic-rich fermented milk drink that you can make at home with just two simple ingredients. This traditional beverage is packed with beneficial bacteria, naturally carbonated, and costs a fraction of store-bought versions.
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Prep Time 5 minutes
Cook Time 12 hours
Total Time 12 hours 5 minutes
Servings: 3 cups
Course: Drinks and Beverages
Cuisine: Eastern European, Traditional
Calories: 110
Ingredients Equipment Method Notes

Ingredients
  

Main
  • 2-3 cups milk whole, 2%, or non-dairy alternative
  • 1-2 tablespoons kefir grains live starter culture

Equipment

  • Glass jar (1 quart or larger)
  • Plastic or wooden spoon
  • Fine mesh strainer or specialized kefir strainer
  • Cheesecloth or coffee filter
  • Paper towel or cloth to cover the jar
  • Small bowl for catching strained liquid
  • Thermometer (optional)

Method
 

  1. If your grains have been stored or are new to you, rinse them gently under cool water using a fine mesh strainer to remove any debris and revive them if they've been dormant.
  2. Pour 2 to 3 cups of milk into your clean glass jar, leaving about an inch of space at the top for expansion. Use milk around 68-78 degrees Fahrenheit for most reliable fermentation.
  3. Drop your kefir grains directly into the milk using a plastic or wooden spoon to stir them in gently. The grains will float or sink, both behaviors are normal.
  4. Place a cloth, coffee filter, or paper towel over the jar opening and secure it loosely with a rubber band or jar ring to allow gases to escape while keeping dust and insects out.
  5. Set your jar on a kitchen counter or shelf away from direct sunlight where the temperature stays between 65-78 degrees Fahrenheit. Let ferment for 12-24 hours depending on room temperature.
  6. After about 12 hours, check your kefir by tilting the jar slightly. It should smell tangy and feel thicker than plain milk with possible separation or grainy texture.
  7. Place your fine mesh strainer over a clean bowl and slowly pour the kefir through it, letting the liquid drip through while capturing the grains. The finished kefir should have a creamy, slightly lumpy texture and pleasant sour smell.
  8. Rinse your grains gently under cool water and add them to fresh milk right away in a clean jar to start your next batch immediately.

Notes

Room temperature matters significantly for fermentation speed. If your kitchen is cold, place jar in a slightly warm spot or use a heating pad on low. Never use metal spoons or strainers with kefir grains. Store finished kefir in refrigerator for up to two weeks. For second fermentation, add fruit or flavorings and ferment another 12-24 hours for additional fizziness.