There's a Paul (sandwiches and pastries) kiosk above the train station. Coming from T2A (AA) you'll see the Sheraton on your left. Turn left to pass in front of the Sheraton and cross to the other side of the atrium. Paul will be on your right. IMHO, Paul has better quality pastries than the other shops in the airport.

As for wine, are you looking to buy a gift, or just something to drink on the train? I'm not certain that there is anywhere to buy nice wine between where you disembark the airplane and the train station. There's a small grocery store in the basement of the airport between T2A and T2C where you'll find drinkable grog. Again coming from T2A, take the down escalator/elevator just after the McDonald's and subsequent café; the market is on your right.

Peace.