Answer:
It is the great nemesis of the lactose intolerant.
What can be underwater, under fire, on fire and taking water all at the same time?
I love to dance and twist and prance. I shake my tail, as away I sail. Wingless I fly into the sky.
What always runs but never walks, often murmurs, never talks, has a bed but never sleeps, has a mouth but never eats?
What is the only letter in the alphabet that does not appear anywhere on the periodic table of elements?
I am your mother's brother's only brother in law. Who am I?