"Fish:
Assuming that you find a river with some fish life that isn't all dead from the virus, this will supplement your diet significantly. My recommended method would be to drag a net along a river. It may take a while, and certainly you will get a lot of junk, but with luck you may get multiple fish per catch.
The major drawback to this would be that the fish would have to be cooked. (or at least somewhat if you or

I may add a section on gathering which I am much more knowledgeable on. My parents signed me up for a course where your dumped in the woods with a survival expert and taught everything you need to know to survive, primarily gathering.
I am also an air cadet and we go out and do field exercises about once monthly. Out there we learn a lot, more of it useful than not."