I havn't grown yet, but I do have many house plants and have been reading up for a grow I'm planning. Seams to me, you should try either the wick method or maybe try some of those watering globes. They are pretty cheap at fall-mart.

I'd try to get them as far as possible at this point. Flood them a couple days, as Kingkronic said. Then stab in a couple of those globes as you leave. If your down to the last 10 days you could even use straight RO to flush.

Question I'd have would be,.. Once they DO run out of water and you'll be gone 10 more days. How well will the plants dry upright, Just sitting in the dry soil? THIS I have no clue about.