All the restaurants play up what people fear about getting sick in Mexico. "Don't drink the water." You hear this and the restaurants will advise you to buy water at $3 per bottle, which is $24 per gallon if you figure it out. A little steep especially if it is free like any restaurant in America. You don't want to drink the water from the tap in Mexico, although you could at your hotel as that will be filtered and purifed. Ask for purified water and ice in a glass at the restaurants. It is the same water as the little bottles, only coming from the 5 gallon jugs instead. All of the restaurants have the big jugs, but oftentimes you will be told that the water in the glass is "not good for drinking." Wrong, it is and all the locals know this and we simply order water in a glass. When they tell us "not good for drinking," we say "viva aqui" ("we live here") and they will smile and say OK, and bring the water in a glass. The ice is purified too. Don't worry about it. You won't get sick from drinking the water in restaurants from the glass. Remember, the ice they serve is not from a little bottle. All the ice is bought from the purified water vendors. The little bottles of water are labeled "Sierra Azul," the water company name, and so are the big jugs. Same water.