Here’s a simpler, cheaper, alternative counter-measure: http://madogre.com/OldMadOgre/Interviews/myths_molotovs.htm
Ideally you would want to survive your encounter, and getting close enough to throw the bottle on the target while conspicuously holding a bottle with a lit wick definitely reduces your probability of surviving the event.
steal or make your own filler for the container and with a few hundred feet of wire you can fire off the countermeasure and have a reasonable chance of not getting shot in the attempt.