Always remember the rule of survival!  Shelter, then water, then fire... and food is last.  Hypothermia, on average, kills within three hours.

   When I update this section, you will be shocked to find out that most reported cases of hypothermia seldom have anything to do with winter weather!
 

   For now; STAY DRY! Being wet makes you loose body heat 25 times faster!
 Have adequate layers of clothing (made out of non-cotton, wicking and breathable materials) with loft.

Have a heat-source available.
Drink water regularly and eat extra calories.

For now... here is a good article on hypothermia from Witeblaze.

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