Answer:
Mouth up it gets filled, mouth down it gets empty.
You can break it or drink water from it.
How many people are dead in a standard grave yard?
What starts with the letter T, is filled with T and ends in T?
The more you look at it, The less you see.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?