there were videos, at the time, of Trump having meetings and one could tell how things were going to go based on what he did with the provided water. There was one where Pence is with him and is apparently going to drink the water when Trump proceeds to put his on the floor--Pence hesitates a second and then does the same with his.

Also, if there is water in the background of a photo one receives part of the message based on what kind of water there is--calm, turbulent, etc.