I use regular peat moss. If you get it from a hardware store, just make sure it doesn't have fertilizer added. Eco-earth is okay; what you want to avoid is the coco fiber stuff (it's too stringy). If you don't intend to feed insects, you shouldn't have impaction issues. Even with insects, I've never had issues with peat. It tends to happen the most with fibrous substrate and coarse sand.
Having a gecko may cure your OCD
. You do realize it's going to poop all over the glass, right?
As far as food, yes, you can freeze it. I make one bottle at a time and freeze the rest. I've only tried watermelon-mango, but all of my cresteds like it.
Please don't make it your last question! We love to hear from people wanting to do this right!
Noelle