Freeze some blocks of ice, and place into water dishes.. Chickens will drink cold water, and will cool off. Sprinkle water hose nozzle on fine mist, into their run area. That will cool the ground via, evaporation. If you have a shallow pool, like a kiddie pool, fill with about 2 inches of water, and allow chickens to wade thru it.
Offer cold watermelon as treat, and maybe some frozen peas. Anything cold going into chickens stomach will help cool the chickens body overall.
If you can get a hold of misters, in short order. those would be more ideal than a hose sprinkling a gentle mist.
I have this, but I do not use for chickens,,, since I do not encounter very high temps in my area. Do set it up for my youngsters to have fun being cool.
View attachment 3241012
You can search to see where you can find closest to you. Above at TSC is available at my TSC currently.
Most other offers of sale are on line,, including Amazon. All depends how soon you can get it.
WISHING YOU BEST,,,,,,,,,,,,,,,,,,,,,,,,,and