My EDC is pretty straight forward: small pocket knife, Fenix light, pocket CCW, reload, BIC lighter, Suunto wrist compass, G-Shock watch, plastic magnifying lens in wallet, plastic travel Motrin tube with some water purification tabs & Ibuprofen. If I'm breathing, they are with me. Shoes I can run, climb, or fight in.
Inside my vehicle, I keep:
Emergency roadside tool kit/parts for breakdown and minor repairs (hoses, bulbs, fuses, oil, coolant, wiper fluid, funnel, jumper cables, tire repair, radiator repair, emergency warning road signals, toolbox, etc.)
Emergency tools for wreckage rescue or stuck vehicle recovery (pry bar, fire extinguisher, tow strap, folding shovel, snow shovel, wheel chalks, rescue tool, small empty gas can, snow chains, glass breaker/seat belt cutter, cell phone charging plug, etc.)
10+ gallons H2O capacity (empty seven gal Aquatainer; full 2.5 gal jug, full 2 qt jungle canteen w/ carrier and sling, & full 2 qt thermos)
10 days food (3500 calories per day) for one person (including both GHB ration items and extra stashed in vehicle ice cooler). MH freeze dried, Mainstay lifeboat rations, instant oatmeal, 5 lbs instant rice, along with misc. semi-stable items like trail mix, beef jerky, power bars, instant coffee, Gatorade powder, camping spice container, Tabasco sauce, and plastic squeeze bottle of syrup.
I also keep 2 x MREs, 10 x canned entree items (2 x each: beef hash, corned beef, large tuna in oil, ravioli, and pork & beans), 4 x precooked rice retort pouches, & small bottle olive oil. Those I rotate out at the end of each summer. About $60 worth of stuff that I don't trust after a hot summer stored in the vehicle. Stored inside a small wheeled ice cooler that doubles as camp table or seat.
Complete set of vehicle camping gear (0 degree F sleeping bag, closed cell foam sleeping pad, pop-up Catoma fire tent, canister stove, fuel, water filter, headlamp/flashlight, knife, hatchet, folding camp chair, fire starters, lighters, cook pot, etc.).
35 lb. GHB designed for 3-5 day's march (with 3 liter bladder, metal 1 qt canteen & cup, Katadyn 1 liter filter bottle, hats, gloves, sunglasses, sunscreen, bug juice, winter Primaloft hooded parka, winter Primaloft pants, gaiters, rain parka/pants, very small 1st aid kit, small Blow-Out Kit, 2 x 3600 calorie Mainstay bars, 6 x Mountain House entree meals, Esbit tabs, caffeine tablets, bivy sack, foam butt pad square, compass, spare socks, Garmin Foretrex, state map, multi-tool, fire steel, Sawyer-mini filter, etc.). For three season use, the Primaloft parka/pants serve as a wearable sleeping bag inside of the bivy sack and as primary outer wear for when the cold wind blows while halted.
Vehicle Trauma Kit w/ IFAK type items.
Paperback book & portable radio. Set rechargeable batteries with vehicle accessory plug. Road maps for everywhere from local to national.
Spare clothing gym bag with hiking boots & set of outdoor wear that includes a spare fleece jacket, BDU style pants, rigger belt, pair of shorts, cargo shirt, hat, hiking socks.
Pair of binoculars and a plug-in Q-beam floodlight.
Cash enough for a full tank of gas, overnight hotel, and restaurant meals.
Low profile Grey Ghost Coyote Brown fabric chest rig w/ multiple stretch pockets. Can be used to carry on-body spare pistol mags, GPS, compass, blow-out kit, water filter, map, flashlight, etc. Kept empty and stored in top pouch of GHB with rain gear. Able to be worn under a shirt, windbreaker, fleece sweater, or other cover garment.
Most of my travels are within a day's walk of home, but have loaded the vehicle to account for being up to 50 miles (3-5 days) away if I have to walk. I can also execute an impromptu bivouac, anywhere at any time, for up to 10 days. Vehicle as mobile base camp. Time and circumstances allowing, I'll fill up the Aquatainer with water, the ice chest w/ bagged ice, and the vehicle gas tanks (including small spare) at a gas station. Otherwise, just move out immediately and top off water from a natural source.
If I have to leave everything behind and move out on foot, I put on boots/clothing, secure the cash, grab the 35 lb. GHB and split.
My vehicle is large enough for all this crap without using up any passenger space. I like the idea of having a mechanical pack horse already loaded up for just about any contingency. Probably overkill, but so what? My most likely event is a blizzard, but I could keep somewhat ahead of events if a CME, EMP, or Nuclear attack occurred.
Plus, I can elect to go camping or hunting on a whim. Just turn the wheel and drive. That terrain is already nearby and I'm already packed.