Primitive Technology is really interesting. This guy is super good at it : https://www.youtube.com/channel/UCAL3JXZSzSm8AlZyD3nQdBA He's trying to get iron smelted right now, but that's really hard. It seems the problem the Lykovs ran into was that their metal items rusted after a while and they couldn't repair them. It's really hard to live without pots, and knives.
I live in the Yukon - when we are out Moose hunting in the fall we often wonder if we could survive the winter if we flipped our canoe with nothing more than we have with us. Every time this article comes up, I have two questions I've never found a satisfactory answer to: 1. How did they light fires? 2. How did they cook and boil water? From experience pots and pans fail after much less than 40 years.
I've read somewhere as a kid that prehistoric people who discovered fire kept it going round the clock since it was more convenient to always have a light source and warmth on demand and wood is generally plentiful enough.