Even with a survival manual it's easy enough to get one harmless food source mixed up with another look-alike harmful one.<p>It's widely speculated that this happened to Chris McCandless aka Alexander Supertramp, who hiked into the Alaskan wilderness back in the 90s to get away from it all but ended up dying from either starvation or eating something poisonous which contributed to his starvation..<p>I guess the point is get ready to kill some small animals and go fishing. The idea that a couple of "Castor bean seeds" could be fatal is enough for me to consider all plant life poisonous unless I'm 99% positive it's a lemon or an apple or something like that, something well known...