you usually make an open fire, but sometimes you need a stove? you don't want to carry something heavy or something that uses weird fuel that you can't get everywhere?
alcohol stoves are great in general, and this one in particular: vargo decagon
It was a bit slow to prime (should get to a certain temperature before it starts shooting flames from the sides) but I deal with this by just covering the whole thing with alcohol setting it on fire, primes it immediately :D
(if you get a vargo triad, you should have an alcohol bottle with about 1mm nozle, it has just a tiny hole to fill it through)
you can also always make a DIY super cat or something on the cheap, and you should use a windscreen, these can be sensitive to wind. yes putting random stuff around is fine-ish, but those aluminum foldable ones are reliable, cheap and light.
10$ power bank / battery charger combo that you can use for day to day stuff but also outdoors.