Perhaps the wick method would help ya.

The Wick Method for vacation watering

Four days isn't that long tho. How often do you usually need to water?
Rusty Trichome Reviewed by Rusty Trichome on . Holiday Watering I was just wondering if any of you knew a reliable and efficient way to self water the plants over Christmas time (4 days away from home, 6 plants, will be about 5 weeks into flower)? Wanted to get started on this project, so I would have time to monitor it before I need to use it. Any ideas? Any help is much appreciated! Rating: 5