Is There a Way to Set up a Self Watering System?

I am in the middle of a flowering cycle for my plants. I am finishing up a real meat-grinder of a summer course and would like to go on a backpacking trip for about four days. There is no-one who lives near to me, and who I trust enough to water my plants while I am gone. The longest my plants can go without water (soil grow) is two days. After that, the heat in the closet dries em out. After four days...well I just wouldn't want to try it. I have been racking my brain for a while, and can't come up with anything real solid.

The only possible option I can come up with is to experiment with putting the pots in a pool of water filled with nutes. I don't however, want to over-water them either.

Anybody have any ideas?

they make watering systems with drippers that you can set how often to water your plants....if it was me i would just water them with plain water and soak them through to pot like with a bunch of water and hope by the time you get gome it wont be dried out