For Diageo, the drinks company, agricultural suppliers typically represent more than 90% of its water footprint, so of course it's vital that the company’s water strategy looks beyond its own four walls to consider sustainable water management and risks in the supply chain. By contrast, what matters most for Unilever in tackling its global water footprint is reducing consumers’ water use when they are doing laundry, showering and washing their hair, particularly in countries where water is scarce.