If you don't mind using non-natural tinders then this might interest you...
Last week I purchase some great hand sanitiser gel that is very high in alcohol and the actual gel takes a spark easy and burns hot on it's own with a blue flame and would make a great tinder material or even an emergency fuel source. Should work well as a fuel in an esbit type stove, open top alchohol can stoves etc or even a hollow in a stone, piece of tin foil etc.
I've used several different hand sanitiser gel's in the last year and non of them were any good as tinder/fuel but this stuff is very good.
I bought it from the UK store chain called B&M, (Cheap shop a bit like poundstretcher) they have it as a twin pack (2 x 60ml bottles) for 89 pence. The bottles are a perfect size and curved slightly like a hip flask so ideal for stowing in stoves, caddies, tinder boxes etc.
I found it in the aisle with the liquid soaps. I went back today and bought some more...!