What Am I?

Lifted from the rightful home of the side pocket of his backpack, I am lifted to quench this man's thirst. As my top lid gets opened and cool cool water runs through me, I suddenly feel lighter. I am losing what once made me complete. Then once I am finished, I am thrown in the recycling with all the other types of my kind. Maybe this time, I will not be finished and be placed in the col cold world of a refrigerator, but then again, most likely that will not happen. Just another day, knowing my destiny as a water bottle.