We have used nipples since the chicks were in the brooder. I love them. We have a PVC pipe one in the coop, and a bucket one for in the run. In the winter, I'm hoping a pond heater and some insulation around the PVC pipe will be good enough in the coop (we don't get below freezing often or for long though). The one in the run I'll likely just add hot water to every day. There's pictures of ours here and here.