That's not very realistic as the OP is flying next week.

If you somehow subtly let the cabin crew know it is your honeymoon, I'm not so sure a bottle of fizz from CW wouldn't be forthcoming. It's those who expect an upgrade who are disappointed, but the OP isn't after that. Still, if you want to be sure, better to take your own bottle and ask if they can put in the fridge for you.

I would expect an airline to go a bit more out of its way for a regualr customer who has flown many non-honeymoon flights first. I made sure my honeymoon incorporated a week in a hotel in New York where I stay often (the Gansevoort), booked into a class of room where a one-class upgrade would be a big step, have noted with a smile that the word "honeymoon" is prominently in the booking confirmation, and have crossed my fingers. They tend to treat me as an "SAU" customer automatically now even without the "h" word, but I'm not counting on anything more than what I booked.