Our plan is for 'emergencies' rather than an End-of-the-World survival scenario.
Our 'Three Day Food' supply consists of 12 small packages, each about the size of a paperback book but lighter weight, and fit in the bottom of our daypacks. Each packages serves two, but we both carry 12 just in case. That actually gives us many days each of very comfortable eating and enough to share with others if needed. No need to ration or skimp. All we need to do is heat water and pour into the self-contained package and wait five minutes. Freeze dried Mountaineering food from the neighborhood Camping store:
Beef Teriyaki
Chicken Polynesian
Hearty Stew w/Beef
Honey Lime Chicken
Lasagna w/Meat Sauce
Potatoes & Beef w/onions
Kung Pao Shrimp
Sweet & Sour Pork
Jamaican Chicken w/Rice
Three Bean Chili
Eggs Scrambled w/Ham, Red & Green Peppers
Spinach Cheese Omelette
Eggs Scrambled /w ham
Chocolate Fudge Mousse
Why suffer?

These days one can eat palatable meals (certainly better taste than most MRE's) without the fuss and bother of cooking. While these are not gourmet meals, they taste damn good when backpacking, and will work just fine for emergencies. 5 year shelf life but we usually use them when camping so they get rotated more often.
Stitchawl