mylar bags and throw in some dissident packs-- Can these be purchased somewere?
What makes food rot is moisture and oxygen, which allows for bacteria to grow & breed.
You can store simple grains, pasta, freeze-dried foods in mylar bags with
oxygen absorbers packs thrown it. These chemically remove the oxygen molecules from the bag which will really slow down the rotting process of foods. Some grains and foods can last for 10-20-30 years when sealed in mylar with oxy absorbers. When using the right amount, the oxy absorbers will absorb all the oxygen in the package until the bag looks like it was vacuumed.
THis only works with dried foods, not foods that have any perceptible level of moisture in them. For these, you can either choose freeze dried, or canning. When done right, canned beef, pork, chicken, etc. doesn't have an expiration date and can sit (in cool dry place) for dozens of years. Discovered canned foods from over 100 years ago were found to contain still-edible meat inside.
You can buy mylar bags and oxy absorbers on the internet, and you can websurf "preppers" sites for info on how to store.