Answer:
I spend most of my day eating white. When I am quick enough I get rewarded with fruit and something blue. In a dark room with blue walls I run from the ghosts that roam the halls
I tremble at each breath of air, and yet can heaviest burdens bear. What am I?
I let water fall on you while everyone else stays dry. What am I?
In my life I must bare, my bloodline I must share. What am I?
As I went over London Bridge I met my sister Jenny; I broke her neck and drank her blood and left her standing empty.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.