What are the necessary conditions for teenagers to travel alone?

Please choose from all aspects of food, clothing, housing and transportation: 1. Bring appropriate clothes, including long, short, cotton and light clothes, travel shoes, slippers, umbrella, raincoat, anti-ultraviolet glasses and portable kettle. You need to bring cotton-padded clothes, moisture-proof mats, carry-on food and crutches when climbing mountains. If you go to the seaside, you need to bring swimsuits, swimming trunks, swimming caps, goggles and bath towels. You can also bring tents, inflatable cushions, baseball caps, T-shirts, shorts, underwear and coats. 2, you can bring your own clean food, and the food hygiene situation in tourist spots is worrying; 3. Toothpaste, toothbrush, tooth cup, towel, fruit knife, nail clipper, mobile phone, camera, video camera, MP3, MP4, MP5, tablet computer, charger, battery, walkie-talkie, toilet paper, pad, wet towel, shampoo, shower gel, conditioner, sunscreen and cosmetics. 4. Gauze, band-aid, purple liquid medicine, cold medicine, diarrhea medicine, motion sickness medicine, Huoxiang Zhengqi water, anti-inflammatory powder, hemostatic powder, scissors, stainless steel chopsticks, spoon, Swiss army knife, plastic bag and purified water. The most important thing is: bank notes, bank cards, ID cards, phone books, accident insurance.