Drinking water springs in public spaces - why should there be more and more of them?

outdoor drinking water dispenser located in a public space

Universal access to drinking water in public spaces has been the norm for many years in Western European and North American cities. In many of them, drinking water springs were established as early as the 19th century and in some cases even much earlier. Today, in Poland too, there is increasing talk of the need to provide as many places as possible with public access to water. Why are drinking water springs in public spaces so important? What can we do to increase their number?