I was interested in the process he used for making alcohol, so I looked it up...
Apparently grapes typically have wild yeast on them, which can act as the starting agent.
And fermented/alcoholic milk IS a real thing - look up "kumis" (or "kefir").
To make strong alcohol though, you need sugar though - kumis usually uses horse milk which apparently has more lactose/sugar. Looking at some numbers from Wikipedia, I'd expect the alcohol content from "meemee milk" to be ~1.5%, if done correctly. ( https://en.m.wikipedia.org/wiki/Kefir#Alcohol/ethanol_content )