I think each ingredient is different. Pork can be preserved by applying spice powder, salt and sugar externally and hanging it in a ventilated place to give it a unique flavor. You can store some dry goods, such as fungus, shrimp, kelp, soybeans, millet, red beans, etc., in case of emergency. Eggs, flour, etc. The key to storing food without a refrigerator is to keep it ventilated and dry, and check and turn when you have time.