Make sure one waterer contains only plain water, so they can balance things for themselves--too much and too little are both harmful.
Electrolytes can go in a separate waterer.
I don't know which ones can be safely mixed, but you could just put out 4 waterers, and let them choose.
You are the one on the spot, and I'm just the one guessing over the internet.
But I would be more afraid of leaving them with no feed. I consider that chickens should have food and water available the entire time they are awake, all day every day, unless I know for sure there is a really good...
Sounds like they are drinking a lot of water--I would trust their judgement, and let them do that.
If the feed has too much salt (manufacturing mistake), they could be extra-thirsty and drinking a lot, and feeling ill.
If the feed has something else wrong with it, and made them ill, they may...
If you don't want to throw out the old feed: just feed from a new bag, and let the current one sit somewhere safe, where the chickens can't get it. Then decide in a week or so if it made any difference. Sometimes it's mentally easier to throw something out later, when you're sure about what's...