Bottled water is almost always provided by the venue/host and not requested by the speaker themselves. Presumably he is not sanctimonious enough to request they remove them - he is worrying about bigger problems and trying to communicate them to the audience that he is speaking for.
1. It's a photo from the Tesla Gigafactory. So that's his own event.
2. I am not sure, what's a bigger problem, increasing plastic waste or the dearth of 'sustainable' cars.
I respect the man for his efforts, but this is ironic, no?