There is a yahoo group called kefir_making. It has a lot of information about the types of flora in it and other ways of using it. There are milk grains and water grains. The water grains are used to make an alternative to pop. Some make sauerkraut, etc. Do not buy it at a health food store, it will last only a few uses, about 7. You need to pay someone shipping to send you some live milk cultures. They grow slowly every day and then one day you will share your extras with someone else. That's the way we do it. I put my small clump in 1 cup of milk and leave it on the kitchen counter to grow. Some do it in the pantry. In less than 24 hours I have a creamy, slightly sour tasting kefir. I make smoothies, mix it in oatmeal, etc. Check their archives for the types of bacteria that you will be getting. Dominic is the creator of this site and is in Australia. He has posted plenty of info to research on his site.