I have never had to make an emergency fire and I hope you will never have to either, but it is always good to be prepared. This instructable describes how easy it is to be prepared with a Waterproof Emergency Fire Tinder Bundle. There are several steps to making this tinder bundle, but they are easy enough that you can complete them in about an hour. The one I made for this demonstration should be enough to start 30-60 fires, depending on conditions. The bundle is made as a center pull bundle so you can pull a piece of the tinder out with out destroying the bundle itself. It is made waterproof with paraffin wax.
Here is a demonstration of using the bundle. (note the glass of water that the bundle starts in