Answer:
It doesn't live within a house, nor does it live without. Most will use it when they come in, and again when they go out.
They made me a mouth, but didn't give me breath. Water gives me life, but the sun brings me death.
This only turns over once you have traveled very far. What is it?
What has two spines and a lot of ribs, and carries much but never moves?
I always follow my brother but you cannot see me, only him. You cannot hear him but you can hear me. What are we?
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.