That was my concern about the nipples. The small amount of water in them might even be worse and the feed may clog up the valve to let water enter them. I have times I need to leave the chickens for a day or two at a time which is the biggest problem.
So, I have now been raising chickens again. I spent my childhood helping my grandmother who raised hens for the commercial egg market but in the "old farmer" way - that is no fancy equipment or caged birds. Big hen houses and some free ranging.
Anyway, I have 8 hens now, Rhode Island Reds...