It depends a little on how serious you want to take this. Or how serious your wife and/or girlfriend will accomodate.
Have nothing in your life you cannot walk out on in thirty seconds flat.
If you live like a pirate, and do all of your entertaining offsite, the options open up quite a bit.
Narrowing down to one rifle caliber and one pistol caliber helps. So does consolidating around one or two systems. An AR and one pistol means only one war belt and set of magazines, compared to the guy who has a 1911, Glock 21 and 19, MNP40, SIG 320, and a S&W M66 as well as a M1A, SKS, HK91, M700 sniper rifle and a Mauser M98 plus supporting gear for all the above.
Same goes for the guy who only has one back pack, multi purpose clothes, etc.
Consider what you are most likely to use: Are you going to fight more with your rifle or your pistol by preference? Let that dictate the amounts of premium ammo you stockpile for each. For example, I would tend to view a 5:1 ratio as the appropriate one for rifleistol ammo.
If you do have duplicates, consider offsite storage of the spares as Cytex mentioned. Thieves are not likely to hit your vehicle , apartment, and storage shed(s) all at the same time. Depending on the circumstance, the same applies to a search warrant or Temporary Restraining Order. Depending on your domestic situation and local laws a Protective order can really screw up your basic plans. Having spare stuff stored off site with few people who know about it is helpful in one of those situations.
Energy dense foods are easy to store if you don't mind the warehouse look. But they require different cooking than all the easy bake box stuff. A Fanny Farmer cookbook and a Betty Crocker cookbook really help make commodity type stuff into great meals.
Knockdown Gorilla racks from Sam's Club, Costco, or the like help with storing stuff in a orderly manner. Gamma seal lids make 5 gallon buckets pretty useful, but still easy to get into.