In my first airline (back in the `80`s), it was the duty of the most junior crew member to ask ALL of the crew what landing drink they wanted.
The airline covered the cost but we were advised that should customs appear we would have to pay the duty.
The said post flight refreshment was delivered/consumed upon taxi-ing..... and on some "london" airport taxi-ways involved a certain amount of back and forth swaying to prevent spillage of the said Imbibment.
Also another way was to "pool" the said refreshment into a recepticle normally utilised for the on board purchase of duty/tax free items, which was duly hung on the door handle of the inbound crew room for us to Dip into.... unless of course Customs intercepted us walking across the Apron with said bag, which strangely developed weak handles........
