Hi

Thank you for your interest.

I have stored the grains with an equal amount of milk in the fridge for more than a week without any problem.  If you change the milk every week, they can be stored for three weeks in the fridge.  Another forumer has stored the grains for almost a month in the fridge (please refer to post #270).  Kefir grains can also be freeze-dried but I have never done that.

You can also air-dry the kefir grains and store them in an envelope, where they will remain dormant but viable for up to a year; I have never tried that.