The same goes with flour.  To make flour usable, you also need yeast and baking powder plus the skill and know-how to bake. Not only that, you most likely will need an outdoor oven of sorts – especially if the grid is down post disaster.   That, and more, will come later, but for now, while covering the basics, it is much simpler and far more practical to stick with easy to cook foods that can be combined into interesting meals without the need for much experience other than opening a can or a package.
We have our wheat, rice, oatmeal, sugar, beans, etc. in 5 gallon FOOD GRADE buckets. Make sure they are food grade. Our local Winco grocery store sells them. We make sure at least one bucket of each thing has a gamma seal lid on it. If you take the regular lids off and on and off and on they will eventually break then you have a bucket. The gamma seal lids have a screw on/off lid. Never stack buckets with gamma seal lids more than two high. Regular lids can be stacked three high. I know people who stored wheat in 55 gallon drums then found out they had to move. HUGE MISTAKE. We disinfect the buckets with apple cider vinegar then let them air dry before putting food in. We’ve been doing this for 40 years.
Both the air rifle and crossbow are on my wish list as I have qualms about having a firearm although I recognize they are useful. My personal weapons consist of a large machete, surival knifes, a SPAX axe, hatchet, several fighting knives, and a slingshot for now. Yes, I know I might need a rifle, shotgun, and pistol. I’m ex miItitary, and have used all three. I’m just hesitant for safety and personal reasons.

Of course, one of the most rewarding things about learning to make something with your own hands is that you can pass that know-how to other people. As students put the finishing touches on their shelving units and sawhorses, I get to chatting with Kathleen Lokey, a flannel-clad farmer from Greenville, Tennessee, who works for a nonprofit called Rural Resources. Through a series of workshops and training programs, the organization equips low-income, food-insecure teens in her area with the skills they need to take care of their nutritional needs, including many of the old-timey ones Daisy Luther teaches: growing their own fresh fruit and produce, canning, pickling, and making jams.

When it burns, EPS produces heavy, acrid and toxic smoke. This obviously presents another serious problem when you are in a confined space, from which there is no escape. Even a small event in which this material merely smoldered with no open flame can/would have dire consequences for the occupants. Exposure to the heavy smoke generated, even if only for a few minutes, has been shown to be lethal.
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.