I agree, Make sure you have someone you can trust.
I currently have a crested, and there have been a few times I've have to leave for a week. My roomate want's nothing to do with my "weird pets", he won't even refill the water.
So I make sure I trade out his normal water dish for a slightly larger one, and I make sure the substrate is fairly saturated. Also, if your cage has a screen top, try covering 1/4 - 1/3 of the lid with some cardboard of something. But not to much as to block the ventalation...this can help keep a little more of the humidity inside.
my crested refuses to eat baby food, so I make sure he gets some extra crickets a couple days before I leave.
Make sure everything runs on a timer and everything should be fine.
This way, I can leave for a week and not have to worry about anything...except my cats figuring out the lock
