Yes, you can give ACV in their water. Start with a very small ammount so they don't get overwelmed and refuse to drink it though. Also be sure they have plenty of ventalation and can get away from the heat as they need to as that can also cause pasty butt. If they are on shavings they sometimes eat them and that can also cause it. Hope they get over it soon!Does ACV help with pasty butt in chicks? Is it ok to give them in the water this young (4 days old)?