Before going, you can go to a Chinese medicine shop to buy some rhodiola and boil water for half a month, which can well resist altitude sickness. You can bring some American ginseng slices. When you get there, putting them in your mouth can alleviate altitude sickness. Although basic materials in Tibet are scarce, they are not, such as vegetables, which are seasonal. I suggest taking money. People there often drink black tea or Pu 'er tea. If you are interested, you can bring some to share.

When you first arrive, try not to do any strenuous exercise for the first half of the month, and pay attention to keep warm, especially the head, which is very helpful to adapt to the plateau climate. If you accidentally catch a cold, you will be in big trouble. This place is no better than the plain.

If you have access to Tibetans, treat them well. Most of them are extremely simple and kind at heart.

If you have time, it will be more interesting to bring some books with you in the army. After all, those places have a small population.

I wonder if you are satisfied with this answer?