We had a friend visit us in Kuna Yala. He's a health junkie and generally isolates himself from any food or water that's not as 'free range' or filtered as possible. He became sick the 3d day of a two week visit and didn't get well till 2 days before he left.

We've always taken the position that it's unwise to take too much effort to clean your intake up. A bit of bugs are better than none at all. For us, it's proved it's case as we've never been violently ill from water or food in unfamiliar areas of the world.