(This would work for pets also.) homemade chicken waterer- so stinking simple and smart! (Wonder if you could do the same thing with a large "Gatorade" cooler and give your hens cool water in the summer.
Showing you my grit/oyster shell feeder I made today. The lid flips up to fill the tubes and is slanted to discourage chicken roosting. The wood is unfinished and all edges are sanded for the chicken's safety.