The public should stop buying bottled water and return to the tap, according to a new campaign.
The DIY Bottled Water campaign has thrown down the gauntlet to the public to tell the difference between tap water and four leading bottled brands.
Those failing the test are asked to refill their plastic containers and stick on a new Tap adhesive label.
The scheme will give 70 per cent of its profits to water charities.
It is estimated UK consumers spend more than £1.5 billion on bottled water each year and discard more than three billion empty containers, according to environmental group Tap.
The group says the UK has some of the highest quality tap water in the world.
Joshua Blackburn, the founder of Tap, said: "The bottled water industry is a triumph of marketing over common sense. It has become a symbol of our disposable culture at its dumbest."
London mayor Boris Johnson said: "We have free tap water in London and by choosing this over expensive bottled water, Londoners can save money, reduce unsightly litter and prevent unnecessary waste."
Environment minister Phil Woolas is supporting the campaign and has attacked the bottled water trend as morally "indefensible".
Meanwhile, Market analyst firm Datamonitor said it latest bottled water market report that Britons have increased their consumption of bottled water at the fastest rate in Europe over the past five years.
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