The river by Gary Paulson

Another great book by the great Gary Paulsen. Brian, after got rescued, he went back to the city and soon became the city boy again. Two years had past since he was reborn in the woods, the thought of it faded in his mind. Still, he had became different, he loved to eat and cook, or even watch others eat. Whenever he go he can hear, smell and hear anything around him. But then something came, he got famous and get searched by the newspaper all the time. And one day, a psychologist named Derek came and offered him to "re-do" what he did two years ago to teach his survival skill to the military. He agreed to do so, and Derek will come with him and take notes. But after a few days, bad thing started to come, Derek got hit by the lightning and got in a coma. With the radio broken, Brian had followed the map and went hundred of miles to get to the trading post with the raft that he had made to save Derek. They had fall into a waterfall and through so many dangers. But he had made it, he saved Derek.