Carnival Cruise Carnival Cruise....?

Carnival Cruise....? - carnival cruise

My husband and I are planning a cruise in July, in line Carnival Cruise in the Caribbean.
They have a spa and fitness center, and much more, all included in the cruise? I looked at their website, but saw nothing, say something about yourself.
Also, how expensive is the food and drinks, too?
I just want to know how much money we need, and for all the bases. Thanks