Good Hand Tools - Auto and carpentry and antique and outdoor
Canned meat/bean combos
Canned pasta sauce
pasta
rice
ball jars with lids and seals, buy as many as you can store
ziplock heavy duty bags - get big ones
Heavy duty aluminum foil - buy a lot, it is washable and re-useable in a pinch
soap, bar, liquid, etc. It doesn't go bad, buy a lot
paper products - buy in bulk and save, keep it in big rubbermaid tubs and it will last for 20 years
SALT
Sugar
Coffee
Flour
Baking Soda
Baking Powder
spices - Pepper, cayenne, etc. food tastes better with them
5 gallon pails with lids - you can fill them with cans of stuff and stack them in the closets, anything you put in the buckets should be canned unless you use food safe mylar and food safe buckets
small bottles of liquor - trade item
hunting ammo - every type for all my firearms plenty of shotgun and .22
water filters
screen (windows will need screens)
blankets (wool)
rope (extra rope is always useful)
canned meats
seeds lots and lots of food seeds
rolls of electric fence wire (1001 uses)
books - entertainment and knowledge
nails screws staples and all sorts of fasteners
spare socks and underwear
good high quality work boots and clothes (your city clothes won't last long when you actually have to work in them)
buy hats, wool knit and big farmer hats, hats are very good to have
good work gloves, have enough for everyone a few times over
extra safety goggles and earplugs (cheap, but hard to replace when you need them)
Charcoal - It doesn't go bad, it is safe to store in a dry corner forever, don't heat with it, cook on it.
a good set of files and hasps (with these you can make other tools and keep up the tools you have)
Knives, and sharpening kit, ceramic and whetstones
Buy a few Pocket Refs
Pocket Ref 4th Edition
pencils and paper
blank books
even if you are in suburbia, think ahead, you may not be able to buy any of this stuff at some point and may really need it.
store everything in a climate controlled area, not damp, not hot