I have an old chest freezer ... I'll freeze some gallon plastic water bottles and put them in there ... helps the freezer run more efficiently when it is not full, and if there's a power outage, I have back up for keeping food cool ... anyway ...
Every once in a while on a REALLY hot day, I'll...
They work! Blueberries, small broccoli crowns, garbanzo beans if you want protein, watermelon chunks ... whatever!
By the way, a goodly sized seedless watermelon chunk straight out lf the fridge is good too. They'll love it and it will help keep them hydrated
Truth be told? Tired. We're short handed at work and the past three weeks some key personnel have had planned vacations ... this past week was extremely busy, I put in over 60 hours, and I am BEAT! Getting too old for those kind of work weeks!
Especially don't use cracked corn when you're worried about them being too hot ... but great to give them other times of the year as a tart. Especially in winter when there isn't much forage to scratch at and they're bored ;)
Take a muffin pan, and in each cup pour in some peas and/or berries and the like. Fill the remaining space with water. Freeze. Hot day? Pop a couple out and out in a pan out where the chickens are! Mine love it!