Knives, guns, bulletproof vests. On the one hand, it is to protect one's own life, on the other hand, it can plunder other people's food and jewelry when there is no moral and legal constraint.

Medicine. It is easy to carry and difficult to manufacture, and it is necessary to treat infections and diseases in war.

Means of transportation. You can escape quickly or find a safe harbor. It may not match from the perspective of value preservation, because it is not necessary to carry it with you, and it can be changed after use, just like in many doomsday movies. .

High calorie food. It doesn't matter whether it's delicious or not. What matters in wartime is portability.

A set of electronic equipment such as solar cells and mobile phones. You can take photos and record information with your mobile phone. Although GPS may no longer be used, the calculator or compass built into your mobile phone is still a very practical tool for survival in the wild. Solar panels can meet the general power demand. Similarly, lighters and binoculars are also essential.

Books and paper maps for survival in the wild.

Water purifier. This needs electricity, so it needs to cooperate with the solar panel on it.

Under the condition of ensuring your own safety, if you have your own safe house and contact channels with black market arms dealers, you can store some enriched uranium and missiles, and it is important to save some drawings and technologies. When peace is restored, it is not bad to sell a technology. This is absolutely commendable. There is no market for valuable antiques.

And learn more knowledge or something. A bad brain blinds everything. At least drill wood to make a fire, the Big Dipper, the Southern Cross, tree rings to judge the north and south, tidal laws, desert water intake, artificial respiration, and bandaging should be learned. If you escape further, the more linguistics you have, the better.