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700.000 litres also sounds like much more than 700 m³. The average German citizen consumed 129 litres per day or roughly 47 m³ annually. The water consumption of 15 people is less than most blocks.
Energy consumption might be a real problem, but I don’t see how water consumption is that big of a problem or priority here.
Oil is different because 1 ppm can ruin a whole litre or something in that direction.