good thinking,sort of a over sized version of my PFD ditch vest.
a couple suggestions.get a small Gaz stove burner and a couple carts for it.cheap clones of the MSR and Brunton burners can be found on Ebay.that way you would have a "real" stove that would make lots of heat.get rid of the water and get some coffee and coco in there along with oatmeal packs.you should also be able to stuff in a small tarp. that country is all rocks and the trees are little sticks so i would want some sort of shelter.a couple nested camp kettles and you could stay wind bound with some level of comfort...toss in a small can of lard and you could turn survival into a shore lunch!!