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>stockpile guns and ammo
>acquire a few hundred acres
>take fruit and nut trees from nurseries and plant them
>hunt deer and small game while waiting for them to mature
>find a wet area and dig a pond
>transfer crayfish to pond and feed them inedible meat scraps
>eat the crayfish when you have enough along with frogs and ducks that are attracted to the pond
>plant arrowheads, cattails, lilypads, watercress, water chestnut, etc and eat them later
Also at this point you should stop giving a shit about the environment and invasive species. You could release hogs and horses and other livestock so you could eat them when they overpopulate (look up Oostvaardersplassen, its a wetland where they released deer cattle and horses to control willow trees and they have to cull them every winter because they breed so quickly)