I was skeptical about this whole thing, but I mixed up a batch and the kiddos LOVE it. I didn't have more than a slurp of ACV left in the house, so I used that, a couple spoons full of yogurt with probiotic cultures (it happened to be unflavored soy yogurt) and a couple tablespoons of unsulfured molasses. After three days, it smelled a lot like sourdough starter does when it starts to grow the right yeasts, so I assumed it was time. I've been feeding the three 14-week-old chicklets a quart a day, and am adding another quart of crumbles + some warm water every evening.
I really was surprised at how quickly they took to it. They go straight to it now and avoid their dry feed altogether.