So you use living soil, right? Depending on how long you plan to be gone, you could try to set up an automatic watering system that could water for a set period while you're gone. Would probably be about the same price, probably less honestly. I was thinking about doing something like this for my big tent so I don't have to keep moving everything out every time I water. Depending on the size of the reservoir you use and how many plants you have, you could set it to last for a 2 week long vacation.