I have the same problem - my geese have had watery poop for a couple of months. They have responded to human probiotic capsules being put in their water every other day, but its not solving anything. The poop gets better and then reverts back to its watery self. The color reflects what they have been eating. They seem very hungry - more beggy than usual, but also displeased with what they are offered (that may just be them, not an unusual thing). Better with increased greens. I've switched feeds - Dumor, (layer and regular) Mazuri (waterfowl maintenance), and Nutrena (layer). They are inside birds so not exposed to worms (that I know of). My girl, however, had a terrifying egg incident and almost died from a severe calcium lack while laying. She was in the ER and I guess could have picked up a germ. She was at a vet location where they didn't see fowl often, but there are plenty of germs from dogs and cats - and worms, etc. I think the timing is that since then, she had watery stools and now her mate does. They are expelled swoosh and total water. I am going to try the buttermilk and egg recipe. I have an apt that I've been waiting for at Cornell up in Ithaca NY. They are so good, its worth the wait - except I don't want to take any life-threatening chances with my kids. Their energy, fortunately, is good, and has been. Any thoughts? Thanks!.