15 pounds is a start. Then you add more water, a first aid kit and spare batteries for both flashlights and your lantern. One blanket becomes three and then you add a sleeping bag. The freeze dried food needs more water and a stove. Then additional fuel for the stove. Your spare socks becomes a polar suit with insulated boots and a parka. Hiking across a frozen landscape to a cell phone signal becomes a walk in the park.

15 pounds becomes 150 pounds and you need a truck...which I have. Better to just not start and tough it out -- cold and hungry.