Get kefir grains and milk
Put the kefir grains into a clean glass jar
Add milk to the jar
Cover the jar loosely with a cloth or lid
Leave it at room temperature for 12 to 24 hours
Check for thickening and tangy smell
Strain out the kefir grains
Save the grains for the next batch
Drink the kefir or refrigerate it
Repeat with fresh milk