I am switching up from the giant 1 gallon plastic waterer to something a bit larger. Plus they drive me crazy - you can't hang them and the botttoms pop off when you carry them! I will have about 2 dozen laying hens needing a waterer. Seperately I will also need a new waterer for 30 meaties, and one more for 15 turkeys. I would really appreciate everyone's opinion - should I go with the galvanized steel double wall version or the little giant hanging plastic type?