The key is to breathe deeply when being burned. But drowning has always slightly fascinated me because when you think about the things that happen when you hold your breath, or when you choke on some water: that uncontrollable urge to breathe followed by a sharp intake of water and then the natural instinct to cough, except you can't because doing so only takes in more water. I'd imagine you'd die choking and spasming as your body fights to get rid of water even when it can't.

Probably best to try and hold your breath until you pass out should you find yourself drowning. It would still suck, but I'd imagine it would suck slightly less if you start inhaling water while closer to unconsciousness.