Gypse
In the Brooder
My girls were too stupid to learn the nipple. I use a watering cup on the end of 1m of 90mm PVC tube. The cups (red) have a little yellow tongue that causes water to be released when nudged. They seem to prefer this to drinking from bowls. The chooks may be nudging releasing the water accidentally, rather than learning to push the yellow tongue. The cups can get a bit of dirt in them. They come off to clean, but you have to be careful that you are not unscrewing them when removing.