DH was wondering if we would be better off to take a small bottle of alcohol to mix with soda or get a beer mug (or card) to refill? Has anyone ever purchased a beer mug that you can refill for reduced rates? What do they cost? We are sailing on the Wonder Sept 29-Oct 2. Neither of us are big drinkers however we would enjoy a drink or two. Just wondering if they would be worth the cost.