I am new to chickens. I have had my flock for about 3 months. I have noticed some of them are having watery poop. I have noticed some poop on there feathers. (not much) I put Apple cidar vinegar in there water about 4 times a week. (1 Tbs/gallon of water) They free range all day and get layer pellets and flock raiser with small amount of crushed corn. They do eat some of our table scraps that I rake out for the cats. My questions are: 1. If it is worms would I be able to see them in the poop? 2. How often should they be wormed? 3. What do I worm them with? Is there worm medicine I can use that I don't have to discard the eggs? Any advice ?? Thanks for any advice !!