Can they go a week without water? Mine in soil can. If not then no, don't leave them unwatered. You could do a cheap Mcgyver type water drip thingee. Hang a gallon container above your plant, and poke a very small hole in the bottom. You can control the drip speed by tightening or loosening the cap on top. You could have it off to the side if you put a grommet in the jug and run a 1/4" hose to the plants or something.

Just use a drip system for a week.