Nice find on the video's John!
Kefir is a fermented milk drink (cultured with kefir grains) that dates back many centuries to the shepherds of the Caucasus Mountains. They carried milk stored with 'grains' in leather pouches, it would ferment into fizzy yogurt! Kefir is even better for you than yogurt, it supplies complete protein, essential minerals, and valuable B vitamins. Also, while yogurt feeds present intestinal flora, kefir goes a step further to actually introduce 'missing' flora.
You need to have kefir grains to make it. The best place to get grains is from a person with an established colony. The grains look like cottage cheese and feel kind of like rubber.
Making kefir is easy; I use a cold brew method for thick kefir.
1) Place grains into a clean jar -do not rinse them first
2) Fill jar 3/4 with cold goat milk (I hear store milk works just as well too)
3) Leave at room Temp for 24-36 hours -occasionally shake jar, loosen lid to let gas escape then tighten again
4) Place Kefir into the refrigerator for a few days or up to a week
5) Strain kefir into clean jar
I give kefir grains free to milk costumers and will ship to people for a small fee to cover costs.