Of course I have a plan. I'm comin' to yer house! You got plently to share, right?
OK seriously. Normally I'm close to home. My shop is 5 miles. The nearest town is 50 miles, with a few stop n robs along the way. We are in NW AZ, about 150 miles from our big city, Las Vegas. Locally I don't worry. Even at 70 I can walk home from anywhere (in town) in a few hours. We always take a 6 pack cooler of water in the summer. Everything else I might need is on me, or in a small "bag of doom." My doctor's office is out in the sticks, about 15 miles away, and about the farthest I go locally.
I usually drive my tweaker-beater around town so I don't worry about door dings. I leave nothing else in it but a blanket, jumper cables and a flashlight I got for free. If going out of town, I'm usually in my truck. My wife has a Corvette, and sometimes we take that on trips. Our Jeep never goes past the next town unless on a trailer. Driving it on the interstate (25 mi away) would be a death wish. Both the 4x4's have full survival / off road kits. Everything from tools to trauma cases, etc.. The only thing we don't store is food, due to the summer heat.
I have a Keltec Sub2000 that currently serves as my "truck gun" in the pickup. Same ammo, mags as my Glock 19. If we are going out of the immediate area, we'll add one or both "Get Home Bags." They are basic "day hiking bags" with the essentials. This would be for like a day's errand run to Vegas or actual hiking.
On a longer trip, like in the summer we traditionally try to bail out of the heat for 3-6 weeks. Maybe as far as Idaho or MT. In that case we will add a full on "Bug out" bag or two with appropriate sleeping bags, and all that. Usually we take a 12 ga and an AR on such trips with the appropriate accessories. In bear/moose country either my .45 or a .44 mag Redhawk with Buffalo Bore in addition to our EDC's.
If something happened say 1,000 miles from home and left on foot. We'd have to assess:
1. Is home still there?
2. Will it still be there when we do get back?
3. What exactly is going on?
4. Mauraders? Roadblocks?
5. Is cross country feasible, advisable?
6. Supply sources along the way.
7. Is there fallout or something in the way.
There may not be much point in going home if it's gone, looted, etc..