If you are traveling in a foreign country, particularly in Asia, South or Central America, or Africa, it's advisable not to drink the water, or else you might get sick.
Instead, always drink bottled water. Make sure that the bottle is properly sealed when you buy it, because sometimes people will fill old bottles and try to sell them as new.
Also, when you order a drink at a restaurant, ask for the drink without ice. You can bet that the ice they use probably comes from the tap, which means it's just as unsafe as drinking the local water.

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