Actually, you already paid the tip--the soda package has 15% tacked on it. They do give you a special insulated cup, but you don't have to use that--you can just show your card and they'll give it to you in a regular glass if you want. Saves having to haul the larger cup around, but that insulated cup is nice around the pool--stays cold longer. It's a good deal if you drink 3 or more sodas a day.