Add grains to one clean mason jar.
Pour milk in jar.
Cover with a paper towel and secure with an elastic band.
Leave for 24 hours at room temperature. If the kefir is not thick enough, check again in 8-12 hours.
When kefir is ready, use wooden spoon to scoop grains to second clean mason jar to start the new fermentation process. Kefir in first mason jar is ready to drink.