When traveling to areas where infection with typhoid fever is a potential danger, one of the most important ways to protect yourself is to avoid certain foods and types of food preparation. Take the following precautions to ensure you are not ingesting foods that may be infected:  Eat food that has been well cooked and is served steaming hot. Heat helps to kill bacteria. Avoid raw vegetables and fruits and vegetables that don't have a peel. For example, vegetables like lettuce are easily contaminated because they're hard to wash well and have a lot of surface area and nooks and crannies where bacteria can hide. If you do want to eat fresh produce, peel and clean  fruits and vegetables yourself. Wash your hands first with hot, soapy water and make sure not to eat any of the peelings. Make sure to drink water from clean, untainted sources. Follow these guidelines:  When you drink water, drink it from a sealed bottle or bring it to a boil for one minute before drinking it. In general, carbonated, bottled water is safer than uncarbonated water. Even ice can be contaminated, so either do without it, or make sure the water used to make the ice was either from a bottle or boiled. Try to avoid anything made with water, like popsicles or flavored ices, which may have been made with contaminated water. It is difficult for food to be kept clean on the street and in fact many travelers report getting sick specifically because they ate or drank something purchased from a street vendor. You should wash your hands often. If both soap and water are not available, you can use hand sanitizer that has at least 60% alcohol to clean your hands. Don't touch your face unless your hands are clean. You should also avoid close contact (i.e. sharing eating utensils or cups, kissing, or hugging) with people who are sick. As designed by the Centers for Disease Control and Prevention, learn the phrase: "Boil it, cook it, peel it, or forget it." If ever you have doubts about whether to eat something, think of this mantra. Remember it's...

How would you rephrase that briefly using Chinese?
旅途中避免病从口入。 注意你的饮用水。 避免食用路边小贩售卖的食品饮料。 注重个人卫生。 记住一个有用的口头禅，学习这个由疾病防控中心设计的口号：“煮沸，做熟，去皮，要不就不吃！”如果你还在怀疑是否应该吃掉它，想想这句口头禅。 在你旅行前注射疫苗。 了解每种疫苗的限制。 不要仅仅依赖疫苗。