Traveling to somewhere you've never been is a hard enough challenge to overcome. Chances are you're coming in to contact with new languages, new cultures, new people, and new foods. Most of these things you can deal with and return unscathed. But if you aren't careful, eating out while on vacation isn't one of them. If you don't know the language, customs, or food of the place you've chosen to take a trip, eating out could end in disaster.
One of the most important thing you need to look out for while eating out on vacation is whether or not you're in a location where drinking the local water is safe. Of all places to travel, Mexico is the most well known for having unsafe drinking water. Most developed countries are safe, but it's best to check the Center for Disease Control's website to see which areas are truly okay and which are not. Even if you are somewhere that the water is fine to drink, but you don't want to take any chances, you can drink bottled water and cold, bottled soft drinks and other drinks. If you're worried about contamination, make sure you don't drink fountain drinks or ask for ice. These are both ways for water to enter into your drinks without you completely realizing it.