I totally agree about all the advice given in this link with the exception of the electrolytes. I give electrolytes to my flock twice a week during the very hot summers we have in South Texas. I have noticed it helps with the heat stress. The page does not say why electrolytes should not be given, I would like to know their sources for this statement to verify it. I will have to do some research because now I am curious about this.
Some of the info is valid, some is misleading or lacking in details...IMO making the whole thing

.
I too give EL during heat waves here, maybe once a week....plain water should
always be available at the same time. Too much EL can throw the systems off, but I don't know the details, but common sense dictates moderation IMO.
The misting systems only work well in arid climates.
I give a dose of Sav-a-Chick electrolytes/vitamins about once a week during heat waves.
It
really seems to help....started this after they saved a heat stroked hen once.
Can mix up a smaller amount, just wrap the packet tight and store in a dry cool place.
Always have plain water available too.
BIG(9x14x2") chunks of ice last all day for wading, sitting, and sipping.
Make space in your freezer!