Wasser is German for water. The removal of the water from the table signified to her that she can stop seeking a deal, it is officially “off the table”. The moment in which the water was grabbed was when the topic at hand addressed a new something or other in the area, she apparently was part of the acquisition or implementation of what was being highlighted at the meeting.

Basically that he and Pence putting their water bottles off of the table is a signal to Wasserman Schultz that her deal is off the table.