I saw ClaudiaWestern asked for a kefir recipe. There isn’t a recipe per se. you just take fresh milk (or whatever kind you prefer) and add “kefir grains” to it. Then let it sit for 1-3 days. It doesn’t sour, it ferments and changes from milk to kefir as the bacteria in the grains feeds on the sugar in the milk. Then you take the grains out of that batch and put them in some new fresh milk and repeat the process.
Anyone who makes kefir at home will almost always have grains to share. They grow and multiply rather quickly. You could check on Craig’s list or local FB group. Most of the time the grains are free, people are happy to share.