Apple Cider Vinegar is wonderful for Chicken health. It will make chicks feather out faster and gain more weight and be generally healthier throughout their lives. Just remember to put the water in a non-metal container. I put maybe 1 Tablespoon to a pint of water. More is ok too, up to about 50%. For grown chickens, if they start molting, put them on vinegar, or if they need worming or have any kind of intestinal disease, put them in vinegar.