Originally Posted by Snownut
I saw a little solar charger...
Forget the little solar charger. You won't be on the Lewis and Clark Expedition anytime soon.
Keep all your stuff to the absolute minimum. Pack light. Anything you pack has to be unpacked and repacked, and constantly.
Worry about extra camera cards and a spare battery for that. People are not taking enough photos these days. Who cares if you die of thirst, I want to see your photos.