Answer:
I am the book one can never finish reading
Late afternoons I often bathe. I'll soak in water piping hot. My essence goes through. My see through clothes. Used up am I - I've gone to pot.
Four fingers and a thumb, yet flesh and blood I have none. What am I?
I have cities with no people, forests with no trees, and oceans with no water. What am I?
I have wheels and flies yet I am not an aircraft.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.