The soda package only include fountain soft drinks by the glass, one at a time. So it is limited to Coke, diet Coke, Sprite, ginger ale, and they will make a cherry coke or a Shirley Temple for you. The soda stamp is on the person's cruise card, and they do check for it. It does not include smoothies which cost extra. Bottled water costs too. You can buy a bottled water package and a juice package. Look HERE
Iced tea is not a bar offering, but is "free" during meal hours in the dining rooms and Windjammer buffet restaurant.
Personally I don't find the packages worthwhile, but they can be so for minors. For adults the soda package breaks even if you consume the equivalent of 3 cans of soda per day.