Let me give you a tip. From everything I've read on here over the years, the medicated feed isn't always a good preventative for coccidia....I've seen several posts where the chicks get it anyway.
If you are going to use the ACV, please make sure it is the unpasteurized vinegar with the cultures(the mother)intact or it won't do much for your chick's bowel cultures at all. It will act like an electrolyte replacement and will help them in that aspect but it won't reculture their bowels or guard against coccidia.
And, yes, you can use the ACV and the electrolytes in their water at the same time...won't hurt a thing.
where do you find unpasteurized ACV? I didn't know they made that. I started using the stuff i had in the pantry and i know that its just the reg stuff