Shade. We plant birdhouse gourds on the fence that creates the south side of the run. We use birdhouse (or bottle) gourds (seeds readily available at most garden stores), bc grow quickly, with large leaves and create a nice cool and shady space. You can use other things, but peas (as an example) won’t grow as lush or tall as the gourds. Some other gourds have smaller leaves or are not as lush.
Water. Our run gets fully shaded between 2-3 pm. At that point, I’ll bring out wet feed. Feed, with water added, let sit for 5-10 min and add more water if needed. Sprinkle seeds or fruit lightly, and add large ice cubes. They love their wet feed!! This makes them drink at same time, and they continue to lay.
Keep their regular water cool, so in the shade.
Some find electrolytes once a week can be helpful. But, always offer plain water in addition to electrolytes so they can choose. Remove at end of the day and dump excess electrolyte solution-perfect breeding ground for bacterial growth.
Several waterers available. This prevents bullying away from the. Water by a higher ranking chicken. Keep the water cool.