Having watched my mate trying to pee out of the DV window of a Piper Lance at night because he was busting and there were no receptacles in the aeroplane, I have always considered tea and coffee to be far worse than an odd beer. It was the funniest flying experience I have ever had - 8,000 feet over Teeside, Bob trying to reach the window with said tackle and failing desperately, me too convulsed with laughter to fly the aeroplane - thank god for autopilots, we whizzed back to a northern aerodrome, landed, stopped on the runway and he steamed for ages !
After flying in France where the instructor suggested we have a Pastis before we went flying and after being offered wine with my lunch by an Air France hostie - I was Captain at the time, I figure that there is some leeway in this matter !
I declined the wine and stached it for my hotel room after just before you light up !