My father and I fashioned a chicken waterer out of a clean five-gallon paint bucket and vertical red chicken nipples. The system works great; there is no leakage, the water stays clean, and it holds a lot more than my other waterers do. The only problem is that my flock literally refuses to drink from it. I've tapped the nipples, held beaks up to it, and even left them without water for a few hours in hopes that they would drink from it. Out of about fifty-five birds, only one will drink from it. Is there anything else I can try to encourage them to use these? Any help is appreciated, thanks in advance.