Just off the Western yesterday, and bought one mug. Was never asked for KTTW card when filling mug, never asked for mug when presenting KTTW card. They are still a little leary of viruses, you empty your own mug or cup into "barrel" and they fill a paper cup and pour into your mug ,or hand you the paper cup. However, ice chest provided on "at sea" days is a free for all, with little kids putting their hands into it, not using scoop, etc. Go figure. If I had two kids, I'd buy one mug and ration their soda intake. Lemonade, water and Iced tea is available all the time on deck 9, so how much soda can they consume when your off the ship half the time in port. (probably more then we want to know)