Ok so my chicks are 2-4 days old, so 4 questions! 1) I heard adding vinegar to their water is something good to do. Should I do this or not? 2) What is the ratio for a quart of water? 3) Someone also said ACV (apple cider vinegar). Is this better than plain ole' vinegar? 4) Do I keep this on them thier entire life? Thanks in advance!