Cancun Hotels Kuartos Mexico Reservations made easy!: 

Drinking Water
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Kuartos.com on 19 October, 2007 11:29:00
 
Water in the hotel zone is drinkable. It is extracted from below the ground and
contains a high mineral content due to the Yucatan Peninsula's geological
origin.
This can cause gastrointestinal discomfort in some people. It is advisable to
purchase bottled water, sold in all areas.
Because this is a tropical area, be careful on drinking water of unknown
origins.