Why not position or cache resources along that route, if you intend to take it? You can go so far as to replicate an entire kit, or simply add some things of which you may not have enough.

Also, I'd like to know that route. I'd like to use it before I needed to use it, so that I knew it and I knew I could do it, if I ever really needed to do so. Of course, this is talk and not what I've done, I'm not going to walk my way out of NYC anytime soon, wihtou the need. I do however walk a lot.

Finally, why one route? What happens if that route is blocked?