Let me set you a little scenario.
You are a pax on a 3 hour flight, where the service in your cabin includes an open bar.
The cabin crew decide to implement industrial action and withold the bar service completely. They announce this after takeoff, so you do not have the option of changing to another airline.
You have your own duty free vodka with you.
Do you either
(a) replace the three mini bottles of wine that you would normally take with three small glasses of your own vodka, relaxe, enjoy the flight and write it down to experience
or
(b) drink only soft drinks and then sue the airline for breach of contract?
The answer is
(B) with a
Good luck caveat.
The conditions of carriage do not permit you to consume alcohol that has not been served to you by the cabin crew.