Chicas Red&Pepper, My chicken house is also small. I live in a tropical climate so are more worried about heat than cold, so my girls don't get locked up at night. Their house is about 30 inches X 30 inches, in which I have 2 nesting areas and an equal sized area not divided into nesting...
When I was on the Farmtek site, they suggested using the screw in Avian Waterer nipples on a "square" pvc pipe that they sell. You could then attach some kind of bottle or hose or ??? at the other end of the square pvc pipe to feed the water to the red nipples. Then all you would have to do is...
Sounds like the Rabbit waterers that can be hung on the outside of your coop is the way to go. Also sounds like you can buy the already made ones at TSC or at PetSmart. That way only the small tube is inside your pen. I have a Lick-It dog kennel waterer in with my younger chicks and they use...