Movies are all well and good, but they are entertainment and they don't necessarily reflect reality.

Consider some real life examples, like:

1) a man exposed to 120 degree temps in the Arizona desert, losing 25% of his body weight - so dehydrated his numerous wounds did not bleed until he partially hydrated. Crawled the last eight miles to the Tinajas Altas completely naked.

2) adrift at sea in the S. Atlantic Poon Lim spent 133 days on a raft in 1942. His raft had 50 days worth of provisions but he spent the last days drinking rainwater and fishing. This was formerly a record for longest time adrift, but I believe it may have been eclipsed, if the story is credible.

These are all folks who couldn't pick up the phone and say "This isn't fun, anymore" and wait for the helicopter. no reality scripts or Holiday Inns nearby, but just stark reality. Of course there is very little drama in watching someone crawl across the desert, or sit on a raft, but real survival often seems to be rather boring, at least to the outside observer