WEF - England is set to run out of water in just 25 years

“About 3 billion litres of water in England is wasted every day through leakages - the equivalent to that used by over 20 million people, it said.”

and then …

”Bevan said if each person reduced their water usage to 100 litres a day by 2050, there would be enough water for an additional 20 million people in the country.”

OR - how about just fixing the leaks!