OP here. Most of the time, students like me have been able to get away with bringing food and drinks to class as long as 1) we don't make a huge mess. 2) we don't bring anything alcoholic (unless it's a final class celebration thing, but even then there's more food than wine). 3) we stay away from the computer labs. If we weren't allowed to bring food and drinks to class, there would be a lot of tired and cranky people who would wonder why there are so many coffee stands on campus if no one's allowed to bring something caffeinated to perk them up in morning classes. In case anyone's wondering, I was drinking raspberry flavoured Real Leaf iced tea; it's a popular brand on campus, so I even I'm confused why my prof didn't recognize it as iced tea.