When to give, my friend said my younger chickens are old enough for layer.. They are about 3 months. I was wanting to put vitamins in their water but I don't know when to though. Also how old until worming them? I probably need to read the label on the back of the vitamins and wormer but I haven't.. Also I have 2 other full grown layers that I would love to worm sinnce they aren't really laying since it's soooo hot. Thanks!!