My pack is similar to others but one item I have added to my kit is packets of powdered Gatorade. Add to warm water and it works great for combatting Hypothermia. It doesn't act as a diuretic like coffee or tea and the sugar will give you a boost.
Also I would like to suggest that all posters take a Wilderness First Aid course if they haven't had any military training. The Boy Scouts now require having at least one trained leader on any backcountry trip.