As I said in an earlier post...I won't be trying to give them brain-freeze but rather attempting to keep the water at a palatable temperature for them is the goal. I figure a good chunk of ice in the water cooler would hold the water to a nice temperature for several days...probably keep it cool until it needs refilling. It is my understanding that if the water gets too hot the chickens will stop drinking which then affects egg production. Except for the really hot times they'll be getting it ambient...unless I'm feeling mighty kind.Chickens don't need cold water but I'm sure they would prefer it like most living creatures do. That said, the simplest, cheapest solution is to keep all water in opaque containers/pipes to reduce any interaction with light and keep the whole system in the shade, all day. My barn typically is a few degrees cooler than outside so I keep a door to the barn open to allow air flow. My coop is attached to the barn and shares the roof with it and all materials and water are kept out of the sun. I added an exhaust fan to pull air from all openings to vent into the run (all wire) and the coop stays pretty comfortable. I have one more vent to open but have to get some wire to protect it. Short of running a recirculating refrigerated tube system I can't think of anything that would significantly cool the water.

I'll definitely be keeping the water in the shade. Thanks for the feedback.