Never had a problem with anything. My wife is usually susceptible to those things, but she's never had even a hint of anything that couldn't be tied to panty rippers. Tapwater is a bit blah, but we used it for coffee and teethbrushing. The bottled tastes better for drinking. No problem with water or ice in the restaurants either. I do tend to not drink milk down there, had an issue in Mexico one time and am gunshy. Nice tip about the coke and lime, I'll file it away. Coke tastes better down south, I believe they still make it with real sugar, and a lime wedge in it makes a fantastic thirst quencher if you are not into Belikin.