I don't know for sure what brand of vodka they serve, I think it's Smirnoff. Can't remember the price, I'd guess around EUR4-5.

• Don't try to drink duty free purchases, they won't allow you. (I think you aren't legally allowed open it until you reach your destination, but I could be talking complete rubbish here.)
• I'm less sure about non-duty free full size bottles. I suspect that they'd ask you to stop.
• If you were drinking miniatures they're unlikely to notice unless you're particularly obvious about it.

Really though, how are you going to get the booze on the plane? You won't get useful amounts through security (although I'd love to see someone bring through a freedom baggie full of nothing but vodka miniatures ) and anything you buy in duty free is off-limits for onboard consumption.