InsaneJournal

If you aren't completely sure you can follow the rules skim through the network to find one of the people offering to take them off your hands. I've name-dropped the military base to rent a room at the community centre for a screening of Gremlins tonight at 6pm. They will attempt to break the rules. The consequences are different for each one.

Sunlight: they'll die, kind of messily.
Water: they'll multiply.
Food at night*: they'll turn into gremlins like the gif there, which are dangerous and chaotic.

*Midnight until the sun comes up the next morning, but it's probably wise to make the cut off more like 9 or 10pm.