Kharzhak - Cruising is an incredible value, and huge, huge fun, but there are some things they charge for.
If you're a big spender, forget everything I say and just live it up.
Booze - yes they charge. There will be a value drink or beer on the cruise, if you like it you're in luck, sometimes its buckets of a certain beer. If you drink a lot you are going to spend some coin.
Smuggle some booze on with you. We do and it saves money.
Premium Dining - Sound like RCCL. They have dining rooms that supposedly have better food. I don't believe it. I eaten at them before, and believe it is the same cut of steak, same pasta, chicken, or whatever they serve you in the main dinning room, but they may prepare a bit differently. Nice for a romantic evening though.
Water - you must mean in the room. They charge for bottles of water in the room. They may even call the bottles complimentary and still charge you, so watch out. Since you will have free beverages else where on the ship, I always go for them and only use maybe one bottle during an entire cruise.
Beverages - You pay for soda. If you need it you have to either pay or buy a soda pass.
Cabin Steward - Find the appropriate tipping amount and how your cruise line does it. I always give the cabin steward a $10 or $20 on my first meeting, slap him on the back and tell him this is in addition to the tip, take good care of us. You will usually get better service and towel animals.
Laundry & Dry Cleaning - it's pricey, but if you need it you need it.
Watch out for Cruising Buddies. You will meet nice people, but once in a while a couple will cling to you like stalkers. They can ruin your experience if you don't watch out.