I doubt there was anything in the water. It looked to me that she felt it was beneath her royal dignity to glug water from a bottle, and that when someone brings water for her highness it had best be in a glass.
Yes, the optics of Herself chugging from a bottle would be....inappropriate.
I’m with you. Optics when being filmed are important.
That don’t mean she ain’t spry enough to fulfill the office to which she aspires.
What you said may be true lol but I prefer to drink out of a glass too, Water, sodas, etc. it all gets poured into a glass.