Nipples area a sanitary convenience for us not the chickens... If they have open water they will choose that almost all the time, the same way they will choose that one mud puddle after a rain over any watering device you have even an open bowl of clean water next to the mud puddle, to them the mud puddle water is simply more appealing... The same way that they will swarm to a handful of feed tossed on the ground when there is a full container of the same feed sitting next to them...
When push comes to shove they will keep themselves hydrated just fine out of the nipples, and as long as you don't see them lined up fighting to drink at the nipples they are doing fine and getting enough water...
I have roughly 100 birds and even on a 100° day it's rare to see more than a handful using the nipples at a time meaning the rest are happily hydrated...
Thanks, that makes a lot sense. I guess as long as they are using them I should continue with them? It really is sooo much easier. And that's true too, they seem to swarm new things too so it could just be oh new convenient water sure I'll drink rather than actually being thirsty?
But that's good to know they will stay hydrated on their own. And you're right, they usually do manage just fine. But I guess I just wasn't sure because they were panting when I went out there