Originally Posted by
Finavia
If you’re worried about consuming your own alcohol on board any flight, just disguise it in a aluminium water flask or any kind of bottle. Myself and the other half sometimes take a few miniatures onboard with us and add them to a coffee or a soft drink. As for people questioning your ability to go without for a few hours, ignore them. You’re on holiday, enjoy it!
Reminds me of my youth- get a 500ml bottle of coke, drink half of it, then top up with Vodka. We called them "travellers" and they were a very good way of getting drunk whilst appearing to be consuming a harmless soft drink.