Have seen a few posts asking for the 'new' Celebrity Drink Package upgrade math. It goes like this. To upgrade from Classic to Premium, it is $20 / per person / day. To that, multiply the gratuity of 18% (20*1.18) to get to $23.60 /pp/day. Most posters here are also Captain's Club members eligible for a 10% drink upgrade discount. So, $23.60*.9= $21.24 / pp / day. So, for a 7 night cruise for two, the upgrade cost will be $21.24*7*2= $297.36.