Just an idea, there have been times where people drink the wrong water, eat the wrong food, that sort of thing and you get what the locals call "Montazuma's Revenge" where you are on the toilet non stop!! While drinking bottled water will help you, and immodium AD and Pepto will help also, this is an easy sure fire way to battle that effect so it never comes up.................or out hahaha!! http://www.trupearls.com/go/Pearls/Home.aspx?alias=Pearls&tabalias=Home
AND me! Past 2 years in a row, although, it was usually the last day and a half. I tend to eat a LOT of cilantro while down there in salsa's and such, which is likely why!