If you are a fan of Cuba Libres, Daiquiris or Pina Coladas, the local rum is great, as well as ridiculously cheap. It's strong, frightfully cheap, and guaranteed to keep your toes warm while riding on the roof of an Andean train. Keeping healthy is not only about avoiding naughty germs, but also about acclimating to new ones. Assume that water is unsafe to consume unless you know otherwise. Remember, however, that once the water cools it can be recontaminated, so keep purified water in a covered container.
Iodine tablets are an excellent alternative when boiling is impractical.
Pork is a common meat in Ecuador, particularly in the Sierra, but it should be avoided unless definitively well-cooked due to the risk of trichinosis. Your local cafe may use water from a variety of sources in making its juices, so exercise caution in your choice of establishments. One way to avoid any unwanted problems is to provide the kitchen with a bottle of purified water together with your request for juice. Milk is often used in fruit juices to lend a creamier texture, but is often not pasteurized, so once again be cautious. Like water, milk can be purified by boiling.