Would mixing white rice grains with boiling water and pouring the mix into a thermos flask and letting it stay there for an hour work (to make edible rice)?
p.s I don't have a thermos flask to try and check but if this technique has chances of working, it would be useful while traveling when boiling water is available but not cooked rice. i.e. use an industrial heat gun to heat up the water and also point that heat gun inside the empty flask for a couple of seconds to heat it as well before pouring the water, add rice and get out of the place in 2 minutes