Most people say to give electrolyte water as an option but also have plain water available.
I dont know about the protein though. It sounds reasonable.
Eating and drinking is always great news. When one of my hurt roos started eating enough to have healthy poops again, I was so happy. Happy about poop. SO laughed at me. Chickens are resilient. One of the hard parts of injuries is making sure they have the nutrients to stave off infection and...
Perhaps from people spraying it in open wounds or relying on it to stop the pecking issue? I cant imagine it being outright toxic, but I havent used it.
Also IMO this is not a helpful way to communicate something because its just going to freak OP out especially since OP hasnt seen your message...