How much money should I bring on Carnival Cruise?

My girlfriend and I are going on a cruise which is 4 night and 5 days. It is the Carnival Cruise Inspiration. We will be celebrating her 21st birthday so we are going to drink a lot. I don't want to get any drink packages. We won't gamble, spa, or do any kind of specialty dining. It's our first cruise... show more My girlfriend and I are going on a cruise which is 4 night and 5 days. It is the Carnival Cruise Inspiration. We will be celebrating her 21st birthday so we are going to drink a lot. I don't want to get any drink packages. We won't gamble, spa, or do any kind of specialty dining. It's our first cruise so we are just eating and doing whats included with what I already paid for the cruise. I will just be spending on drinks. So how much money should I take? I was thinking $1,100 just to be safe.
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