Unlike LF, I'll try to answer your question.
On Holland America cocktails will range from:
$4.50 to $6.00 for beer
$ 6.00 to $12.00 for mixed drink. Well drinks are in the $6 - $7 range and specialty drinks (martinis) will run up to $12 for the larger ones.
Soda is $2/can and $1.25 for fountain.
This information is about a year old but I believe the prices have remained the same.
HAL now offers a drink package for $39.95/day for drinks below $7.