Answer:
Draw fire or fill me; I'm still empty.
Whoever makes it tells it not. Whoever takes it knows it not. Whoever knows it wants it not
I am pronounced as one letter, written with three. I come in blue, black, brown, or grey. Reverse me and I read the same either way. What am I?
To cross the water, I'm the way. For water I'm above, I touch it not and truth to say, I neither swim nor move. What am I?
Lighter than what I am made of, more of me is hidden than is seen. What am I?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.