Using a hotplate and water purifier is way better in my experience. Not only is it 100% safe and foolproof, but it’s also much more convenient. You can purify up to 100 water at a time with a purifier, against 1 at a time with fire, plus all the juggling containers. It’s also much faster in game time. A hotplate can just sit on the floor next to your pile of meat and you can come by anytime you’re hungry to make some cooked meat, no hassle and no need for firewood.
A stove requires finding an LMOE camp, I believe (but those lack lighting), and a brazier requires crafting skills and equipment for welding.
You might think that, batteries being a limited commodity compared to wood, they shouldn’t be wasted on a recurring need, but you can find/craft so many of them, and cooking/purifying consumes so little, that in practice they’ll last you a lifetime. Just in case you didn’t know, flashlights among other common drops, will spawn with batteries that you can (U)nload.