Drowing or burning to death, you pick getting shot..... ok then.
I would rather drown. I have had my hand on fire, that was bad enough. Just the thought of my entire body been on fire, my body parts falling off, yuk. Drowning wouldnt be so bad. If you know you are going to drown, just drink the water, easier than going through the pain of trying to hold your breath.
I heard a story about a cop who got in a car accident. His car set on fire and his head was just a head, no features to it. His nose melted off, he lost an eye, his ears melted off. It was horrible to see, thr thought of the pain is just sick.
Drowing all the way..... if anything.