Crohns disease is a chronic inflammation of the small intestine, or sometimes all of the digestive system. I causes pain and diarrhea and sometimes ulcers in the colon. I have hever heard of Beaver Disease. Many crohns patients have immune system problems and a lot also have family members that have some type of bowel problems like IBS (irritable bowel syndrome). I have never heard of someone getting Crohns from drinking bad water.