Look up autowatering. People set contraptions up to self-water (with timers and small pumps). I tried to do it with my first grow but couldn't get it set up the way i want so I have about $100 of currently-useless components sitting in my closet. Funny enough, i have no choice but to reattempt setting it up this weekend because i'll be traveling next week and i want to avoid asking my friends to water again (not that they did anything wrong the last time)