After three consecutive years with a dry winter, Cape Town faced a water crisis that was so severe, its municipal authorities began bracing for Day Zero – the day they would have to shut down the city’s water supply, and residents would be forced to line up for daily water rations of 50 litres per person.

That level of conservation is foreign to most people in urban regions.

For instance, an average person in the US goes through 303 to 378 litres of water in a day, according to the United States Geological Survey (USGS).