I got a drawstring net bag (from a bag of tennis balls), attached some string to the bottom of it, and I put the bag over the water jug part, use a clothespin to hold the drawstring out of the way after tightening it, and hang it from the top of the cage. A large tuna can or large chicken can is also exactly the right size to put under it which I have also used. I like the drawstring bag the best because I don't have level ground and hanging the waterer keeps the water always level no matter the terrain.