Of all the supplies they suggest you legally or illegally procure, epinephrine sounds like the biggest stretch. We don't want to burst anyone's bubble, but if you suffer from life-threatening allergic reactions and really think you're going to survive limited food sources and practically nonexistent medical care, we've got a mint-condition fallout shelter to sell you.
Label everything with the date of purchase. Sharpie pens were created for this purpose. However you choose to keep track, rotate your stored food items the best you can without getting paranoid about it. Many of the “use by” and “best by” dates on canned and packaged goods are put there by the manufacturer but relate more to taste and texture than actual spoilage. See the next item.
Again, the reason we tend to look sideways at those who get a little too into prepping for an apocalypse is because of their smug optimism. People actually being realistic about a dangerous future would be better served joining the military or ingratiating themselves with high-level government officials than agonizing about a little mouth scuzz or foot fuzz, right?