Ok stupid question, can you really carry alcohol onto the ship?
Yes you can!
This is from cruisecritic.com.
Disney Cruise Line Alcohol Policy
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Disney Cruise Line Alcohol Policy
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Cruise Line Alcohol Policies
Are You Legal?
Drinking age on both of Disney Cruise Line's ships is 21 for all itineraries.
Bringing Booze Onboard
Bringing liquor onboard at embarkation: Allowed, for consumption in cabin. Note, however, that fragile items (read alcohol) must be hand-carried onboard in a day bag and/or carryon, which cannot exceed 22 inches wide, 14 inches high and 9 inches deep. Beverage coolers are not permitted onboard.
Bringing wine or Champagne onboard: Passengers who request a wine steward to open and serve a bottle of champagne, wine or liquor will be charged a corkage fee of $18 per bottle.
Purchasing liquor in port: Allowed, above rules for bringing onboard during embarkation apply.
Purchasing liquor in ships' duty-free shop: Held until debarkation.
Free Drink Caveat
Adults who participate in select activities (like karaoke) on Disney Wonder and Disney Magic can be eligible to receive complimentary shots.
This is from cruisemates.com.
Disney
Honesty is the best policy with Disney, and moderation is the key. Here is the line's policy as told to us by the media relations department.
Guests can purchase alcohol in a port and bring it to their stateroom.
Disney Cruise Line does not prohibit Guests from bringing alcohol onboard. However, please be aware that any fragile items (including alcohol) must be hand-carried onboard in a day bag and/or carry-on, which cannot exceed 22" wide, 14" high and 9" deep.
Please note that beverage coolers are not permitted onboard (cannot be checked or hand carried). Guests who request a Wine Steward to open and serve a bottle of champagne, wine, or liquor that has been brought onboard will be charged a corking fee of $15.00 per bottle.
What is the policy on bar service on Disney ships?
The drinking age aboard ship is 21. Valid photo I.D. is required. Disney Cruise Line® reserves the right to refuse sale and/or service to anyone.
Can coolers and/or food items be brought onboard?
Coolers are not permitted except for those needed for medications, baby food or items related to dietary constraints. Items must be pre-packaged, unopened and cannot require any food prep from the kitchen. Coolers filled with personal items (e.g. soda, chips, candy, etc.) may not be brought onboard. Homemade items or pre-cooked items purchased on the way to the ship will not be allowed to be brought aboard. Also, open bags or containers of snack items should not be brought aboard. All items will need to be stored in the stateroom; the ship's storage and/or refrigeration are not available to use.
Each Guest returning from the Eastern Caribbean to the U.S. can bring back up to a total of U.S. $1,200 worth of duty-free merchandise (retail price). However, no more than $800 in combined purchases can be made on board the ship, St. Maarten and
Castaway Cay. Or, the entire U.S. $1,200 exemption may be used on purchases from St. Thomas alone. Each Guest 21 and older is limited to 5 liters of alcohol (only 1 liter can be acquired in St. Maarten or on the ship, with an additional 4 liters being exempt if purchased on St. Thomas, provided at least 1 liter is produced in the U.S. Virgin Islands).
I had a hard time lifting it up for security to check 
!! 
we took before our disney cruise ...
