The don't really need additional humidity. I do keep a heat source on 1/4 of the critter keeper I keep mine in just b/c they're in the basement which sits at 65 or so. Food-wise regular ol' vege scraps work. I've started supplementing my crickets w/ 10 parts powdered milk to 1 part herp calcium supp tossed w/ plain rolled oats. I have no idea if that's actually doing anything or not but I like to think the calcium is making it through.