Answer:
I can fall off a building and live, but in water I will die. What am I?
I describe a toilet cleaner as well as one of Santa's reindeer
I am rarely touched but often held and if you are smart you'll use me well.
My days are numbered.
I am so delicious that I require a house to contain me.
It comes from crystal and melts to a treat. Add it to your tea to make it sweet. What is it?