Ali,
I do grow at home, and faced this last summer...but it was only a 1 week trip. I left the catts outside (they summer on my patio, and Texas in August is HOT), and watered them well before I left...also pulled them up into a place where they got a bit more shade. They were fine. The things that needed more moisture, I left indoors, watered well, and had my son water once, mid-week. They were also fine. I guess it would depend though on what you have and how long you will be gone...