Hi Fellow Zonies! I am going on my second year raising chickens here in Arizona. I have 6 one year olds and 8 new (February) chicks. BO, RIRs, Black Australorps, SLWs, Americaunas, and BRs.
Here are a few things I have done....
I make large ice cubes. I use a soft lunch bag insert (the plastic support from inside the bag) I bought at
walmart as my ice cube tray. I never used the inserts but held on to the plastic inserts thinking they would be handy one day. Boy are they.
I bought a nipple waterer that attaches to a 5 gallon cooler. No dirty water and the best part is I put the big ice cube in the cooler so they have cool water to drink. The girls love it!
I also make the big ice cube and put it in a plastic container with low sides (like a baby pool). They peck at is, walk on it, and then when it melts completely, they have cool water to walk around in.
I sometimes will take the hose and give them a muddy place to scratch and lay in.
As far as the heat in the night, be sure your coop has plenty of ventilation. I don't have electricity in my coop but I have plenty of cross ventilation.