One of my hens is very thirsty and her poops consist of a pool of white or clear watery stuff with a few lumps of poo in the middle of it. No normal solid poops. She is about 2.5 or 3 years old and is otherwise normal. Eating as normal, running about and laying eggs. The only difference is that her eggs are white shelled. They used to be brown. I am worming her at the moment just in case it is worms, but as yet have seen no improvement. Both my hens eat the same diet of layers pellets and free range, but the other is OK.