Half of my chicks have poop building up on them. I’ve been reading what to do and have been cleaning them as others have instructed. My question is, how much apple cider vinegar do I add to the water? Should I put x amount to a gallon of water or be adding a splash to their daily water? Also, how long should I add the acv to their water? Should I switch between the acv water and probiotic/electrolyte? Thanks