Possibly the greatest thing in the world that makes my blood boil and my mind to become enraged in Cultural Marxist and SJW offendedness, anger and uncontrollable rage is seeing individuals drinking tea, water or anything else while giving a lecture; be it a secular lecture or dhamma talk.
To see someone set up their drink glass or other drinking receptacle simply to give a 30 minute lecture then start to slurp and gulp during the lecture sets my mind on fire as my mind forms the view this is the height of rudeness to the audience and arrogance, elitism and an utter total lack of discipline and self control on behalf of the speaker.
As I write this question, my mind is, right now, in this moment, spontaneously born (opapātikā) into Sīlabbata-Parāmāsa-Hell.
When Bhikkhu Buddhadasa was alive and a very old man, often on the verge of death, I observed him giving dhamma talks for 90 minutes to 2 hours and he never drink anything. During one series of talks over a number days, when it was reputed his death was imminent, he occasionally lost consciousness (when the translator was speaking) and had to be woken up (and he would continue to the dhamma talk right where he left off).
Anyway, after taking a breath or two to calm down, my question is, does the Vinaya forbid drinking while giving or listening to dhamma talks?
For example, I recall the Vinaya says things like listeners of dhamma talks should not wear hats, etc.