I just did this….
I bought this: http://www.culturesforhealth.com/milk-kefir-starter-kit.html
I followed the instructions and started rehydrating the cultures on regular milk. Once it started making Kefir I switched to coconut milk. I live in Florida so my Kefir usually is ready in about 12-18 hours otherwise it’s too thick and turns into curds and whey.
It’s very, very easy.