I think this site might be for homemade kefir that one gets. (kefir.net)
Do you think that these would work with homemade kefir in place of the buttermilk... I have so much and am always looking for new ways to use it up. (101cookbooks.com)
If you are the adventurous type and would like to learn how to make your own homemade kefir, check out this recipe and tutorial. (cheeseslave.com)