They make some that are water cups...I think chickens across the board would prefer the cups. I am going to order some and see if I can affix them to a bucket as well.
I use a 5 gallon bucket with 4 nipples in it that came with my original 3 hens and roo...so when I got more chickens I guess they saw the older birds using it and figured what the hey...or chickens did what chickens do and pecked and found that if you peck at the red thing under the bucket that...