I know this thread is old but I've been searching for a waterer that doesn't use plastic but isn't insanely expensive for a long time. Any progress? Ideally, I'd still like to use nipples as I think they are much cleaner. I've found one stainless steel waterer with nipples but it was insanely expensive.
Any reason why you can't just use a food grade bucket to make your nipple waterer? It won't be leaching anything into your water. The nipples on the other hand would be the weak link since I would be VERY surprised if any on the market certify that the plastic or metal pin/springs are "safe".