Our group has been studying this hard and we have decided that since we have one less port day and one port day is RCI owned ..... we are going to get a drink package and not worry about what each drink costs.
Here is another source to look at for prices - don't forget to add tips on top of the price, another plus of package is that is included.
http://www.shipcruise.org/royal-caribbean-alcohol-policy-drink-prices/
Really depends on what you like to drink and how often during the day. Of course our normal day doesn't include alcohol but for a vacation, especially a cruise we want to enjoy. Each day will vary but DH calculated a full sea day and came up with this:
3 Waters (online folks say $4 bottle) $12
2 Seltzers (that is his soda) 6
3-4 Beers (at beach pool etc) 24
2 Pre Dinner drinks (crown) 16
2 Dinner drinks (shots, crown....) 16
2 Show or bar drinks 16
Total per day $90
x 5.5 days = $495 (planning one port day gone all day)
+ 15% tip = $569 Cost out of pocket
Cost $385 with package