Kelly Kettle?
Outdoor stove to quickly boil 1.2L of water
uk.knivesandtools.eu
that's the badger - other versions are available.
I have the additions for cooking on the base and for cooking on top of the kettle.
So far it's survived everything I've put it through (including the dishwasher) from exercises, RAF movers, patrols, blah blah blah.
upsides - virtually* squaddy proof (without weighing as much as a landrover)
no gas - the RAF can't find a reason to confiscate it
it'll run on any solid fuel you can fit inside and light
downsides - bulky
not very tactical
takes longer than gas, but doesn't take very long
you'll have to find some kind of solid fuel , I've used paper, dry animal poo, hexi, sticks, some material that looked exactly like the t-shirt that **** ******* was looking for.
*survives reasonable squaddy activities but I doubt it would survive being run over by a vehicle or fat stacker/mover. for the last two they'll be abling and not running