Make sure you get any vaccines that are needed for the countries you’ll be visiting and pick up malaria prophylaxis if it’s recommended. If you’re traveling in places where mosquito-borne illnesses are prevalent, you’ll want to use insect repellent and sleep under a mosquito net whenever possible. You’ll also need to check to see if the tap water in your destination is potable; if not, be careful to drink only treated water and avoid other drinks made with tap water (or ice made from tap water), as well as raw fruits and vegetables that can’t be peeled.