Hi there, welcome to BYC! 
Raw unfiltered acv might have some probiotic effect but I don't think it kills coccidia. NO supplement should be given more than 10 days in a row. Don't believe everything you read. 
Anyways... I NEVER use medicated feed.
Coccidiosis is only an issue when there is an outbreak.. often caused by droppings in the water or shaving being wetter than they appear or by over crowding. Though some people may face special weather or pasture conditions and need to deal with it. Keeping things dry water poo free, and stock density low can go a long way towards a healthy flock.
If you have other chickens... bringing in a clump of dirt with grass and all can help give these guys a little exposure before going out full time. They will also get some grit and have a grand ol' time playing int he dirt.