If you're planning on sitting out an emergency in your regular living area, the usual recommendation is that you find the storage-stable things that you normally use, and simply stockpile - and rotate - your normal supplies of the more durable items.

If there's a possibility of having to move with all of your supplies of course the requirements are immensely more difficult to meet; and many of the things you'd want to have in a mobile emergency cache wouldn't be things you're likely to integrate into your regular diet.

Debates about how to "defend" or "supplement" your cache with weaponry need to consider that the knowledge, experience, and likely physical condition of the user play a tremendous role. A longbow is of little use if you can't draw it (as with a sprained wrist or elbow) and even a few years can be the difference between "prime-of-life" and stumbling invalid. (voice of experience?)

Don't forget the can opener - even if you're not stocking many canned goods. You may need to forage.

Simple first aid and medical kit need to be considered, but if you're past "prime athlete" age note that many prescription drugs have extremely limited shelf life - relative to what you might need.

Suitable clothing in good repair should be part of the stock, but - a year or two of reduced circulatory efficiency can change your boot size by two or three increments, so maintaining and updating the store has to be considered.

Basic tools such as saws, hammers, knives, jacks, prybars, rope and tarps should be considered.

And DON'T FORGET the CHOCOLATE. (for trading purposes even if you don't care for it).

John