Firebellies will be just fine by themselves for a week. Just fatten them up before you go and they'll be fine. Many people only feed them once a week as the norm. I feed mine smaller meals more often because I like to watch them eat. But they'll eat as much as you feed them so don't let them get overweight. The best thing about FB toads is that they are always awake and doing something. They do need a water section and prefer a 50% water/land ratio rather than just a water bowl. Mine spend most of their time sitting on a rock in the shallow water. 2-3 inch depth is fine. Do make sure the setup is easy to clean as they are messy frogs. They will drag soil with them into the water as they get in and out 50 times a day. I use a small external canister filter to help keep the water clear. I think its the zoo med 501.