You can lock them in the coop for the rest of their lives if it's big enough for them. Not a very nice thing to do, but you can do it. A week certainly won't hurt them. "Big enough" varies, but if you're planning on vacationing often, I'd definitely try for considerably more than the minimum 4 sq ft per bird indoors.
You'll want someone to come by daily. You can do every other day, but if you've got layers, that's risky (broken eggs = eaten eggs; bored hens = eaten eggs), and it's always risky from a water point of view, anyway -- you'd be surprised how they can conspire to empty a waterer, anything from knocking it over, to somehow putting a hole in it, to filling the recepticle with bedding, to just flat out weird things like the seal just deciding to give up the ghost randomly. Leave entertainment objects (cabbages, squashes), and if you ever suspect you have a picking problem ahead of time, peeper those birds.
The most important thing is to find someone you trust to watch them. And make sure you can REALLY trust them. People are weird about birds, more likely to blow them off than a cat or a dog. Also, make sure to WRITE down instructions and emergency proceedures/phone numbers.