The goal of such recommendations is not to ensure people can survive 72 hours without access to additional supplies, but to ensure that the society as a whole can function at such a situation - that requires a lot more than just a drop of water and barely enough calories to stay alive. If the enemy can collapse your society just by destroying a couple of power plants and water treatment facilities, you’ve already lost the war. Or climate change, or blizzard or what ever it is you are facing.

That being said, I do agree that the food you store doesn’t need to be anything special or tasty - just something to keep you working your job and taking care of those that depend on you.

NandGame is a browser puzzle game, where you start of by building basic logic gates from relays and progress from there all the way trough processor design to compiling high-level languages. It does not hold your hand too much, but the invidual puzzles progress so incrementally, it feels almost magical how easily you learn to build computers and compilers.