You can do sprouts one of two ways as far as watering them goes:
1. Just put them in whatever, wet them down enough to get them damp, and walk away. This works - if they are on a damp paper towel, or under damp burlap, or whatever, it will work. If you rinse them, drain them, and leave them until the next day to rinse them again, they'll sprout. They will sprout slower this way, but it works.
2. Soak them for about 8 hours, not more than 24 hours (24 is on the long side, optimal is about 8-10). Drain them, and then just rinse them a couple of times a day, or check to ensure that they stay damp.
When I sprout mine in a sprouter system, I only remember to rinse them once a day. It works here - some areas might have more problems with mold rinsing just once a day.
It isn't a picky thing though. They basically just need to stay damp and not get moldy. As long as that happens, any system will work, any schedule is fine, and it is pretty hard to kill them.
They aren't like a souffle, where if a kid runs through the kitchen at the wrong time, it ruins it. Of course, if they are in an open tray, and the kid SNEEZES on it, you will certainly want to rinse again...
