Answer:
Draw fire or fill me; I'm still empty.
If you lose me, you may cause people around you to lose me too. What am I?
Drop me and the world will shatter. You can always find me where you empty your bladder. What am I?
By Moon or by Sun I shall be found. Yet I am undone if there's no light around.
I have green hair a round red head and a long thin white beard.
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.