My Husband Started Having Stomach Cramps And Diarreah Saturday Night.

My husband started having stomach cramps and diarreah Saturday night. It is Monday afternoon and it is still going on. He did drink water from Nellis AFB as he was out golfing in 100 degree weather. He had a wet towel around his neck, a hat on, and drank water the whole time. We all ate the same things and no one else got sick. He tries dry toast and water or tea. He tried chicken noodle soup today. Always same result........pain, cramping, then diarreah. Otherwise he is a very healthy Phys Ed teacher.