After months of on and off food poisoning in S.America, I asked a local how they deal with it. "Oh, we're born shitting blood," he said, "so we don't notice." So I asked an old Tairona descendant (RIP Chito) who was not such a wise guy, and got the magic remedy I still use and recommend widely. The juice of a green lime in a glass of water. Can be sweetened or not. Even 1/2 a lime is usually sufficient to knock out the salmonella bacteria which cause "food poisoning" in a few hours. A fresh-squeezed limeade per day and I never got "Montezuma's Revenge" again.