You really only need enough for a few months.
Most people will be unprepared, so everyone is going to go around killing each other for supplies, the few who are successful at that will now be at the same level you are. If you don't have a really safe location to hold out throughout this period then you'll die too, regardless of whether you have 20 years food stored or not.
If there is no solution beyond that time, then only people with fertile rural land will be alive.
What if you scavenge and hunt for food
That brings you into conflict with whoever owns the land, unless you like eating dog with rice.
Go native into any forest and most people would be dead from starvation in 4 weeks, there are many TV shows that show how hard it is. Our way of life depends entirely on people growing our food on vast farms and the global industries that keep them in operation. Even people with functioning homesteads would struggle when they lose this support. That clogged oil filter you need? sorry, that's made in China now, your tractor is scrap
The only survivors at Year 2 will be large organised communities of literal peasant serfs.
The only event worth planning for is one lasting a few months
What if you have like ten thousand 9mm rounds and eat deer and go fishing in Montana could last a lifetime bonus if you use a silencer to Not m not alarm people nearby
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