Brennan had no food or water during those four days in the wilderness. It's amazing that he was even found in an unbelievably good and healthy condition even with all of the wild animals crawling about the area.
It is just too bad that the other twelve year old (missing since last year) still has not been found, even though the two locations of these two separate boy scouts where Brennan was found and the twelve year old was last seen are very close by.