I think it's just to make sure that you get a glass of water. If you order the water last, the waiter is somewhat likely to forget the water. The look-and-nod

I think it's just to make sure that you get a glass of water. If you order the water last, the waiter is somewhat likely to forget the water. The look-and-nod might be to make sure that they got it, but I understand that part less.