I have a pretty nice setup that works but....I Have come to the conclusion that nipple water systems are only useful if you have a heated building or freeze protected water lines and an automatic fill system. They also require floor drainage because chickens are messy drinkers and spill more...
I an so sorry to be so negative but with a fancy PVC, horizontal nipple system my coop stunk to high heaven and my flock used about 3 gal a day in the summer. It is now winter and because I messed up the cable entry to the pipe for the heater and it leaked, I removed it and put back my heated...