Initial equipment: Will suit up to 2 adults and 2 kids:
Large 4x4 car/truck loaded with food and survival tools (knives, axes, firelighters and gas camping stoves, fishing rod, first aid kit etc). If you can't afford a big truck, no worries, declare Marshal Law on somebody who does have one. Your survival is more important than theirs.
More than one sewing kit (which are small anyway) for first aid, fixing clothes, rips in the tent etc.
1x suitcase full to brim with clothes per person.
Guns, ammo and gun tool kit, other weapons like a sword, machete and axe etc.
A decent sized dog, collie, German shephard, staffy bull terrier or labradore, obviously trained. No piddly chihuahuas, scotty dogs, jack russells or handbag mongrels.
Location, if the end is nigh, I'm heading to northwest Scotland. Lived there a few years back and know the terrain well. So that's my location sorted. Just remember the tent to get started while I build a more substantial hut.
As for weapons, guns yes but handmade would be better than guns in the long run. Guns, rifles, explosives etc, need maintaining, oiling, parts. Eventually, they break and ammo will run short no matter what you do.
Handmaking weapons is the way forward, easily maintained, fixed and restocked with ammunition and, when (not if) you do run short of guns and bullets, you've had practice building and using your bow, bola, spear, spring trap etc.
As for food, pack what you can that will last, nothing fresh like fruit, veg or eggs etc. Tins, cans, processed foods in sealed packs have so much chemical ingredients they hardly ever go off. The rest you can hunt, there's plenty of deer, rabbits, hare, wild cats, fish (including trout) etc, due to the location.
When you don't catch anything, you've got your tins to fall back on. By the time your tins and processed junk food runs out or goes off, you should be pretty able with your bow and setting traps that work.
Storage for decomposable food, again see location, cold ground works just as well as any fridge. Wrap meat in cloth, bury it. Done.
Water, again, see location above. Plenty of mountain springs to take a sip from.
By the time your supplies, gas stoves, tent, guns, ammo, 4x4 petrol, fishing rod etc run out or break, you should be well on your way to being a survivalist. Building fires and weapons (including hunting tools), spearing fish and trapping deer, keeping warm by maintaining your wood/rock cabin.
It's all practice, just remember to take the initial supplies to give you a good start while you learn.