“Remember Euell Gibbons?”
Yes — and (IMHO) every survivalist should read his books. There’s a lot of very good (and tasty) food in the wilderness. We cultivate only a tiny fraction of the total number of edible plants (and I’m not talking about wood). I’ve gone on camping trips where I packed no food — just one of Gibbons’ books. Foraging kept me well fed.
(There may be newer and better books on the subject — I stopped looking after finding Gibbons.)
Reading Euell Gibbons taught me to open up sea urchins to eat the eggs. Actually quite good.