Mine grew up with the nipples and now an open pan of water sort of confuses them. 

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that's when I learned it needs to be vented so I drilled a hole about an inch below the rim.
Just like my Mom's dog, fresh water 3x day yet love too drink out of water puddles 
I put in a 5 gallon bucket with nipples going around the bottom I would fill each little cup up with water and chickens would come and drink water out of the little cups but never bothered to peck. and If I waited for them to figure it out that all be dead of dehydration
