Like a wave building far out at sea, the momentum behind universally available cool fresh water is growing steadily. It is driven by the realisation that the world’s plastic habit must be broken, quickly. It’s reckoned that a million plastic bottles are bought worldwide every minute; the meaning of this number is best expressed in the images of mountains of litter made of this virtually indestructable material piled by the tides on to otherwise deserted beaches in remote corners of the globe. It is an unnecessary disaster. There is no reason why water has to come wrapped in its own environmentally lethal packaging. This week, London’s mayor Sadiq Khan pledged to develop a city-wide network of water fountains and refill stations. A Bristol-based campaign to set up refill stations in city centres and seaside resorts is flooding across Europe. Australian cities such as Melbourne have digital maps showing where drinking fountains are available. There could be so much more – airside refill stations in every international airport to slash the thousands of bottles jettisoned at security would be a good start. A refill station on every platform in every railway station would be even better. The choice between income from retail outlets or a low-cost move to help end plastic pollution is really no choice at all.