This is how you fold a wire bead tire.
http://www.rideyourbike.com/tirefold.html
But I agree with the others, go ahead and replace it now and carry a folding tire for the trip. If they don't offer your favorite brand of tire in kevlar, buy a very light weight tire as an emergency only tire. Use it until you can order the right one. Order it from where ever you are and have it shipped to a post office a couple days ahead of you on your route.