Soft drinks were about $1.75 + 15% automatic gratuity.
Once onboad, go directly to Sabatini's and Sterlling Steak House to book your reservations.
I don't remember seeing powdered creamer; but then I don't use it and wouldn't have asked for it; millk and half-and-half for sure.
You might want to take your own if you really want it.
And lastly and most important--have a great cruise and keep in touch.