When Paul Bowen visits one of Coca-Cola’s facilities he hands a small plastic cup to the people he meets.

The cup measures water leaks. Hold it under a drip for five seconds and it calculates how much water is being lost from the leak every year. “It’s extremely visual and you’d be surprised how many people go and get a wrench and tighten things down very quickly,” says Mr Bowen, Coca-Cola’s water technologies manager for quality and technical services.