Can't you just ask a relative/friend to spray him 3x a day? I mean if it's only a week he can easily go wothout food for that time.
I usually let my mom take care of my chams as she also feeds my cat. I move the enclosures to the kitchen sink and use some garbage bags to guide mistingwater into the sink so she doesnt have to worry about drainage water, then I just feed chams before I go, easy.