Answer:
Round like a dishpan and smaller than a bathtub. But the ocean can't fill it. What is it?
What is that you will break everytime you name it?
You throw me out when you want to use me and you take me in when you don't want to use me. Who am I?
I have one, you have one. If you remove the first letter, a bit remains. If you remove the second, bit still remains. If you remove the third, it still remains.
Break it and it is better, immediately set and harder to break again.
What never gets any wetter no matter how hard it rains?