Water is a very precious commodity and in some parts of the world, even armed conflict has taken place over its supply. Today, in Scotland, the hotly contested issue of bottled water vs tap water is causing deep divisions.
Drink water out of the tap - that's the message that environmentalists and the government want to get across.
Ministers at Westminster and Holyrood have announced that bottled still water will no longer be served at government functions or meetings.
And the Environment Secretary, Phil Woolas MP, has claimed that drinking bottled water is "morally unacceptable" in the face of the environmental impact.
But speaking to the Politics Show, the SNP's Environment Minister, Mike Russell MSP, sought to distance himself from these comments.
He said: "I think that's just jumping on a bandwagon, I don't think there's anything morally unacceptable.
"If we impose on people constantly in the sake of a greener Scotland we actually turn people off, I want to persuade people."
Green agenda
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