Luanda — The brightly painted old shipping container with solar panels on its roof and high-specification filtration devices inside looks out of place in this dusty Angolan village of Bom Jesus, 50 kilometres east of the capital Luanda.

But it will soon be providing nearly 20,000 litres a day of clean, drinkable water to the area's 500 residents who currently rely on dirty supplies from the nearby river.

Designed by Canadian technology company Quest Water Solutions, the stainless stee...