So $1000 - a pretty decent amount, but not enough to really go wild. A backup vehicle loaded down with gas, water, food and guns would be nice, but...
I'd focus on socking away backup / redundancies for EDC gear - down to decent clothing. An operational cache, but geared towards equipping me with daily carry tools instead of a full battle rattle.
Basically, I could show up in my flip flops and underoos and leave fairly well set up.
Lean would be towards those things that would be difficult or impossible to get in a crap-hit-the-fan scenario.
A Glock 9mm would form the core of the cache. 17, 19, 26 - doesn't matter much, a Gen 2 is fine. A couple mags - maybe 33rders, a decent holster, spare mag holder and quality ammo. $500-$600 if you shop around, buy used, etc.
Why a handgun and not a pump action shotgun, WASR AK or something like that? As a CCW-licensed average everyday dude, a concealable handgun is more useful to me in a broader array of circumstances than a long gun. If it looks like the USA is going to turn into Syria, then that might change.
After the handgun, I'd have a low profile, EDC-friendly backpack, set up similarly to the one I carry daily. Maybe with some EdWood-style tricks up my sleeve.
Leatherman, flashlight, metal water bottle, burner cell phone, batteries, chargers, some toiletries, basic snivel kit, USB with backup info, etc.
Added to the pack would be a spare set of clothes - jacket, fleece, button up, t-shirt, cargo pants, beanie and work gloves.
Broken in hiking boots. Basic, sturdy, earth-toned. A good belt, too.
I'd throw down ~$250 for the bag, contents and clothes. So we're at $750-ish now.
Remaining funds would be spent on medical stuff (fish biotics, gauze, thing of bleach, wound cleaning), a decent sleeping bag, a couple flats of water, basic ready-to-eat foods, spare batteries and a 5 gallon can of gas w/ stabil added.
That should get close to $1k, with a cache equipped the deal with a fairly broad array of troubles. Up the budget, and I'd likely set the rest aside in cash. After a healthy pile o' cash, then I'd look to add a long gun and ancillaries.
But, if really compromised for space: I'd take the handgun stuff, a good knife, flashlight, burner cell phone, a lighter and a fat wad of cash.