The alternative foods are high in calories, balanced in nutrition and easy to store and carry. The best is dried yak meat, followed by dried beef, and others are canned meat, sausages, fruits or preserved fruits, bread and cakes. Generally, it takes a short time and a short journey, and you can carry regular camping food. It is suggested to bring some emergency food, such as chocolate and fruit candy, according to the situation. If the food is long-distance and the nutrition is not comprehensive, you can take multivitamin tablets and calcium tablets to supplement it. Water is recommended to be neutral or weakly alkaline, such as tea, mineral water or sports drinks. Do not use carbonated or other acidic drinks. You can also cook in the wild if you can, but you should pay attention to the safety of fire.