One of my chickens was accidentally left with no water on a hot day for a couple hours. We discovered her and we got her in a wet shaded dirt right away. We have her water through a dropper and put wet cloths on her. We then brought her inside and lined a laundry basket with a moist towel with access to water. We did add a bit of Gatorade to her water and it really helped. We gave her little bits of food here and there and let her sleep inside. We would see if she wanted to walk around but couldn’t . After three nights inside with close watch, she has recovered and is back with the flock! Still keeping a close eye but seems to be doing good. While she was inside, she laid a soft egg and was also pooping green, and is still pooping green.