The best response to heat exhaustion is good old H2O. While electrolytes can sometimes speed recovery, most often a steady supply of good, fresh water coupled with reduced body heat does the trick. I had 3 hens go down yesterday in our 100 degree heat (the silly birds all tried piling into one nest box ... sometimes they are just stupid ... grrr). Luckily I found them because I check on them frequently whenever we have such high temps. They were all three in bad shape, not standing, eyes glazed, panting weakly... I recruited my DH and DS and we took them out to the wading pool (their yard "air conditioner"), put their feet in it for about 10 minutes and cupped water to their beaks. Once they drank a bit and I knew their body temps were dropping (btw, you can tell a chicken's body temp from the bottoms of their feet), we brought them inside under a fan and kept encouraging them to drink. Within an hour, all three were sitting up and clucking at me in displeasure because I wouldn't let them back out to their buds. They spent a night in the "hospital" room just to make sure they were 100%, and right now they're once again snuggled up on their roost in the coop. Now if only they can remember that three in a box = "fried" chicken, maybe they can stay their butts out of the infirmary for a while ...