Well, if you were gone for a day or two, you may be able to get away with putting a great big salad in for them.. but a week? You will have to get someone to look after them. I go out of town very often to travel to my hometown, and with the snake, monitor, fish, cats I can leave them safely for 5 or so days (if I have to), but there would be no way that I could leave Blazey without someone to feed her. I left for 5 days over thanksgiving and she was already showing bad signs of dehydration. I don't know many folks here, so I was lucky to have someone look after her as well as they did...
Good luck!!