In my friend's school, teachers aren't allowed to drink (no water, coffee, etc.) during class. I have never heard of this before because none of the schools I've worked at have this policy. I never eat during class, but I always have tea and water with me. My school doesn't have any kind of policy on this. I feel bad for her because her throat gets so dry when she's talking, but she's not allowed to have water. Is this common?