I tried switching to the nipple waterers, too. Some of my chickens took right to them and others didn't. I like the peanut butter idea and will try that.
It is so hot and humid down here already and I lost an 8month old pullet to heat stroke.

I was wondering if she didn't get enough fluid and I added the other waterer back; at least until the weather cools off, which won't be till October.

I always use organic ACV, the one with the mother. It's good for their respiratory system and their guts as well. But I just learned on this site that ACV can inhibit calcium absorption. :/
So in the summer when it's hot and chickens eat less they drop their calcium and can lay soft shelled eggs. I stopped adding the ACV for the summer months and you can even give them some baking soda in their water to create a more alkaline environment....makes better eggs.
So many things to learn about our wonderful birdies.