5 differing flasks for different outdoor persuits, Hexy-cooker (army issue), two gas (screw onto bottle type), one of those terrible single gas stove things with the gas cartridges (that keep sticking and aren't even wind proof) and a turbo-flame lighter/swiss made fire steel for dry day's & long walks, if on holiday and doing day ticket we have the Aldi portable gas cooker.
I like Gas for the convenience, the fire steel for its practicality as it makes you search out good tinder and kindling so tests skill, all depends on where and what situation demands are being made.
Looking into getting one of those the trangia cookers having found a way to make the fuel cheeply and easily
Happy fire lighting!