How to make your own rope
It is quite easy. You strip the bark of a young branch that is green. Separate the inside of the bark. You will be using the inside not the outside strip to make the rope. The inside is a greenish yellow.
In an emergency, for saving someone etc, you don't have time to braid the rope properly, it is okay just to take the ends and tie together tightly. The strips would still have that half inch to inch flatness but that doesn't make it unworkable.
For a braid, the strips need to be separated into smaller parts. Braid after braid can be added to form thicker braids.
Some people soften the strips in hot boiling water to roll the strips and make a neater rope. With this knowledge a person can use the rope to make a raft etc.
Make sure you have the basic wilderness skills to safely enjoy your trip.