My sister-in-law sent me an interesting pamphlet awhile ago:
Entitled "Family Food Stockpile for Survival," it was issued by the USDA in 1964.
Those of my generation (I was born in 1962) doubtless remember the "air raid drills" in which children were filed out into the school hallways and instructed to crouch on the floor with our hands over the backs of our heads.
This little pamphlet outlined the potential dangers America faced, and recommended a two-week supply of food and water. It even included a selection of "Sample Meal Plans" for the novice prepper.
The meal plans, we are assured, include foods that can be eaten "as is," as well as foods that require cooking. It instructs the reader to try and secure means of cooking, if possible. It also covers water storage and purification, etc.
Altogether it's a surprisingly comprehensive little publication. Obviously some things are a bit out of date, but most of the info is still sound.
But of course back then, as now, most people ignored it.