If you have a gun and a vehicle you can get to a store. If you manage to make it to something like a bass pro shop, or even a smaller local store, you can secure it up and bunker down for years.
This is assuming it hasn't already been locked up by other people. But I imagine the vast majority of people would not think to do this, they would try to get home and board up their own living. Eventually they would run out of food and die.
Get to a store of some kind, either partner up or shoot anyone already there, secure doors and windows, easy peasy. Can ride out however long it takes.
If you somehow made it to a Bas Pro, you'd literally be able to live there for the rest of your life because of the snacks, and guns+amo. Only problem would be securing some likely very large windows. You'd probably have to section off a smaller part of the overall store, after moving all the guns and food into the most secure place.
I've thought about this a lot.
Bass Pro:
Huge amount of preserved snacks, such as beef jerky and candy. Calories+protein. You could survive a LONG ass time on beef jerky and candy alone. Jerky for sustenance/protein, candy for carbs/energy. And they will last essentially forever before spoiling. They have other shit too like protein bars, hot sauce, bbq sauce, and hell probably even vitamins somewhere.
Restaurant: Every BPS I've ever been in has had at least on restaurant. Much more and much healthy food and tools to cook it, plus numerous other benefits.
Guns: A lifetime supply of every gun for every situation, every optic for every situation, and enough ammo to singlehandedly put a massive dent in the local zombie population. You could find a way to get up high and just snipe them off all day for any that get too close. Plus potentially trading the guns and ammo for other essentials with other survivors.
Animals: Every BPS has ponds with bass, turtles, and other fish. Not sure if you can breed them, but at the absolute worst eat them. Or when you get real lonely view them as pets
Clothes and shoes: More than enough of that shit so youll never be with out
ATV/4 Wheelers: if shit really hits the fan, at least you have an escape vehicle