Mine made a little hammock before it molted. For the life of me, I can't remember if it molted in it or not though. Now it is a burrower. My other one just stays on top of the substrate... diehard terrestrial.
Give them water via the water crystals... they'll drown easily in any water dish when they are that small. If you don't have water crystals, give them a slice of apple, potato, or cucumber, and they can get their water from that. For food, anything from dry dog food or cat food to unmedicated chicken mash to actual "cricket food"... although I wouldn't purchase food since they'll eat most anything. They'll grow fairly quickly, but you can speed things up a bit more if you keep them warmer. Good ventilation is necessary to keep mortality low. You can put them on a thin layer of any dry substrate that is suitable for T's.