You don't need to purchase a package in order to have water or soda; those can be purchased individually. Water is fine from the tap, so no charge at all unless you insist on bottled water.  Add up the price of water and soda based on how many you are likely to drink per day, then decided which way to purchase is more cost effective.  The laundry package is generally $7/day times the number of days in the cruise. The advantage of unlimited, especially in hot climates, is you can come in at