Because sitting with an empty glass of water (or whatever) waiting to get it refilled before you continue eating is stressful - for me at least, I drink a lot w

Because sitting with an empty glass of water (or whatever) waiting to get it refilled before you continue eating is stressful - for me at least, I drink a lot when I'm eating. Trying to get the attention of a waitperson who doesn't want to wait on you is stressful.