Very comendable philaw. I'd donate something if you get it off the ground. I.m always willing to give a little to people who are having a rough time of things.
If I may make a suggestion though. I think the basic concept is good but maybe the idea of not being resupplied is all a bit uninspiring to most people. Not people here because they mainly know, or can imagine what you'd be going through. But you'll need to inspire the general public too if you really want to make some dosh for these people. You'd also need to ensure you are getting enough calories for the physical activity you're undertaking. (walking and carrying a load.This isn't meant in a bad way but something like you are going to do a certain walk in 5 days with no sleep would have more WOW factor and therefore raise more money. Of course going without sleep for 5 days would be extremely tough for anyone and walking the whole time even tougher but if you want to raise any significant amount of money it's got to be something that people know you will have suffered doing (that's human nature) and are perfectly serious about your cause. The 5 days and sleep thing is just the first thing to pop into my head, but you get the idea. This is just my opinion though
Study nature, love nature, stay close to nature. It will never fail you. - Frank Lloyd Wright