How much water does it take to make one latte?

The “CHANGE” slogan used during the American presidential election has find it’s way to the masses again, this time we need to change the way we think and it’s WWF who suggests it:

200 liters of water for a cup of latte! I thought it should be much more that actually the liquid it contains, but I never thought it needs that much water actually to produce a simple cup of coffee. I wonder who and how calculated it…

Indeed – we waste a lot of resources along the way, but I think it’s gonna change in the future, not so distant future…

UPDATE: I’ve investigated a bit the numbers and according to

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