I'm really fortunate being from Birmingham where our tap water is the most palatable in the whole country (although I personally have to have something in it as I don't like plain water, from the tap or a bottle).
I've just spent the weekend in Hull and omg, the water there is disgusting, it was even horrible boiled to make coffee or tea. My son works there and fills a bottle to drink from at his desk but if he's not drunk it within just over an hour he says it seems to stagnate.
Whilst I was there, I noticed a couple of my fellow b&b guests drinking water from tetrapak containers, just like longlife milk or fruit juice.
I don't know where they bought them because I never saw them in any of the shops. The guys were Scottish so they may have brought them down with them.
I'm thinking these tetrapaks could probably be the first step in moving away from all the nasty plastic bottles for those who choose not to drink tap water.