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Old, but quite ok!
Another strange but really good movie about cavemen; The Man from Earth - Movie Trailer - YouTube

Getting it then... if it's not good I'll hold you to it... the fire I mean.

This one?
https://www.youtube.com/watch?v=DT3cNE6Fsd0

It's easy to make a tube furnace, get any old metal tube and some Ceramic Blankets, some comes wet in bags, once they're dry they harden and can take o lot of heat.
I like this guy, making fire and...

I believe it's tinder, dry distilled cloth, to make it really good you can boil it in KNO3 first.