I'm really cautious with electrolytes, but I don't have much knowledge to back it up. Just observations.
I've noticed if I slightly overdose their water, they don't drink as much because they're bothered by the bright yellow color. Maybe they can't even see yellow, I don't know. But I've noticed this pretty consistently.
And one day, feeling like doing something stupid, I decided to try some chick electrolytes in a glass of water. It reminded me of Gatorade and looked tasty. I ended up jittery and wired and almost sick for hours. I also had an urge to roost.
They'll probably be fine. But all creatures have very specific balances of vitamins and minerals and other thingies to keep them stable and well. If they get less or more, it can cause problems. So, when it comes to additives, less is probably best.