COULD have been? I saw that water bottle he kept drinking from. I'll bet it was Vodka. I know I saw him taking pills before that tantrum with Specter.
Oh I don't know if he was drinking during committee. Alcohol takes fluid away and it's necessary to drink a lot more water when you have had some drinks.
As for pills, Senator Ted normally "works" a short day and no doubt had issues with putting in a longer than normal day, even by our standards.