Great tips on staying cool during 100+ degree weather! Shade, frozen water bottles for chickens to get close to, and hosing the run in the morning.
I drop ice cubes in their water container to keep their drinkining water cool. I also place ice cubes on a brick inside a pan. The ice melts, and the brick stays cool. The chickens stand on the cool brick.
For treats, I have chopped watermelons and worms (ewww) frozen in muffin tins with water. The chickens peck at the ice, and like the treats.