https://www.raising-happy-chickens.com/electrolyte-drink.html
https://www.fresheggsdaily.com/2017/05/how-to-make-homemade-electrolytes-for.html
Here are a couple blog posts about making an electrolyte solution.
Just make sure the little one is also drinking some plain water too, not just...
Oh, I am so sorry this happened. Hopefully you got to it in time. I think focus on getting it warm. That should be priority one. Once good and warm (and hopefully perked up), then try getting it to drink. Do you have electrolyte powder or nutridrench on hand? If not I will look for a recipe for...