Yep, even if you have lots of ammo, if you're lacking heat, water, and food, you'll have to venture out and put yourself at risk. I think it would be like a nuclear blast after a loss of power for weeks. If you can lay low for a week or two and just defend your location, a lot of the population will kill each other in the mayhem. Then it will be safer to go out.
You'll at least have some wiggle room to plan your next step.
The population that's left, after a few weeks, is the baddest of the bad, however. Need groups to survive.
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