Do you have a particular cruise line in mind? If so, best to ask on the board for that cruise line.
Again, the variables can be considerable. For example, on HAL, you essentially need to consume $55 of charged beverages per day to break even. Soft drinks run a little over $2 each...waters about $4 each, beers around $7-8, mixed drinks between $8 and $11, wines and champagne, $9-11. I don't know the cost of specialty coffees. So, the combos of various beverage types to get to $55 per day is numerous.