Coming back from Mykonos last year to LHR on an BA A320 in Club E,
No water left and the potable water down to less than 20% for a 3h 45m flight.
During turnaround crew went across to the supermarket over the road for about 120 big bottles of water - no idea how they got ''liquids'' on the a/c, but we are in Greece...
During the flight back to LHR the water ran out, so water bottles placed in loos to wash hands etc - also ran out of loo roll, hand towels and tissues. (and all the M&S food in Y down the back was eaten by the outbound pax)
Quote from Crew, these planes should not be going to the Greek Islands as we have these problems every week...