We went with 3 kids. i wasn't worried about the 2 smaller ones b/c juice, lemonade tea and milk was free and that was fine with them. My teenager loves his pop and I has decided i would get him a card. When push came to shove he was fine with the juice and milk and he managed to make it the while trip without any.
Carnival Fantasy 6/05
RCCL Sovereign of the Seas 4/07
RCCL Navigator 12/07
RCCL Navigator 11/08
RCCL Liberty 7/4/09