Kefir is like yogurt, but it's healthier for you and easier to make. Put it on a counter and let it go. How easy is that? UPDATE: According to one review, if you store kefir in spring water, they will die. You can store them in spring water for short periods in the fridge. OR you can store them in a little milk. I've done both and both work fine. I've heard you can store them in the freezer even, for longer periods of time.