I wasn't going to add this but I've decided to.
My eldest granddaughter, when she was about 7, came to me, almost in tears, saying they had been told at school how scarce water is and that we mustn't waste it or we won't have enough water to go around. She asked me if that was true.
I told her that it depends on how you look at it but no-one (in Britain) is going to die of thirst (within the foreseeable future). There hasn't, to my knowledge, been a prolonged drought in Britain so why is there a proclaimed water shortage? If it isn't due to a lack of rainfall - could it be lack of investment in the treatment plants and/or the lack of investment in building new reservoirs? My guess is that that is exactly what the problem is so it more to do with the organisation than what ordinary people are doing with the water they are getting.