We pre-buy our drink tickets before the cruise that way I can buy a packet every pay day. That sounds awful doesn't it. Go to www.carnival.com
& at the top chose Gifts then chose Most Popular Items from the left drop down menu. On the second page you will find Bar Credit coupons. They are 4 for 21.25 in a pack. You can ask for these to be delievered to your room on the first night.