Hi... I am flying to Penang through SIN. My itinerary is IAH-SFO-SIN-PEN. We will have only carry on. Would like to purchase some duty free champagne at SIN. Would I be able to carry the duty free alcohol on a Singapore Air flight from SIN to PEN? Do I have to put the alcohol in my baggage and check it? If yes, can I do that at the gate for the flight to PEN?