I use chick feed until the bag runs out, which is somewhere around the 2 week mark. Then I switch them over to Flock Raiser. I do fermented feed, although sometimes I fall behind with the fermeting, and on those days it is just moistened feed. I do think it helps with water intake.
Between 2 and 4 weeks, I slowly begin limiting food until I am down to two feedings a day -- once in the morning and once shortly before bedtime. To keep them from losing their minds, I throw some sprouted fodder and old vegetables around their yard, to keep them moving and hunting for food during the day.
I've raised several batches with the system and have had really good luck with it. Never had a broken leg or one suddenly drop dead on me.