How many mals can you get from a can of baked beans? You can get 14 servings from a pound of beans. Grains of all types can be cooked like rice hence a pound of grain can give you a weeks worth of meals. Plus you can grind them into flour and make bread or pasta, Beans and whole grain keep almost indefinatly but once ground or cooked (even canned) have alimited shelf life. Just a bit of humble advice.
Additionally, some people may want to prioritize skills over supplies, the idea being if you have the skills you can make or find everything else. I will not derail the discussion by delving too far into that, but the fact is having what you need on hand will always save you labor and time. A truly skilled individual can sustain themselves with rudimentary or even no tools in very austere conditions, and there is no substitute for that kind of mastery, but no “lone survivor” who is honest would choose to go without provision or tools when the chips are down and they had a choice.
Freeze-dried food is nothing new. As early as the 13th century, the ancient Quechua and Aymara people of Bolivia and Peru pioneered a form of the process by exposing potatoes to the freezing temperatures of the Andes overnight, then drying them in the sun. In 1937, Nestlé used industrial technology to create the world’s first freeze-dried coffee, and in the 60s and 70s, the US military shipped freeze-dried food rations to the troops in Vietnam.