I personally would never drink potable water, unless it's a cup of tea. We get provided with bottled water, however after seeing pictures of the inside of aircraft water tanks I keep the tea down to a minimum. Quite a lot of countries including quite a lot of European countries, we are prohibited, in BA, to upload potable water.
The BoB sounds like its going quite well, with rumours from crews that it's being sold out. It's a shame it has happened, but the public want cheap flights and they are price sensitive. It's all about price on short haul. Expedia and other travel sites often list flights on the headline price, and as a result BA don't get listed anywhere near the top, because they used to have everything included. A £7 price difference meant Jo Public went for LCC. The reality is that several free G&Ts later, they'd forgotten that they've saved a considerable amount of money on their way to Malaga.
BA reduced the offering to compete to the extent is was ridiculous and hardly anyone ate it anyway. If the public select the airline on price, you might as well compete on price.