H2O is a normal by-product of cellular respiration, and a human body is over 50 percent water, now I'm not saying that the wicked witch of the west was human, but she would have to have a really crazy genetic makeup for a single bucket of water to melt her completely, I don't even think she could have DNA. In "Wicked" Elphaba instinctively knows to avoid water from birth, OK I can buy that, I'll even give in to the whole "water will kill her" for the sake of this argument, but to think that a person could avoid water their entire life is ridiculous, as is the idea that an infant could squirm out of an adults arms to avoid a bath, and what did they wash her with in the book? MILK? Which is has all the same molecular attributes as water, and what about the amniotic fluid? And if she ever got thirsty what could she drink? Orange juice? no. "Mineral tea" What the hell even is that? Tea made from oil or something? that sounds disgusting. She couldn't ever eat any fruits or vegetables, or meat come to think of it, I guess she ate rocks. And what about sex, one would assume that the other person would be enjoying themselves enough to sweat, so one sexy romp in the hay and she can fit in a matchbox. All these things would have done her in long ago, and yet she continued her tyrannical reign over OZ all those years without anyone storming the castle with a super soaker, until some out of town farm girl "accidentally" throws an entire bucket of water right at her face (completely missing the scarecrow mind you) and what was that bucket doing there anyway? If I was her I would have had all the water removed from my castle as soon as I got there.