>>You must be a rehab candidate for this whole exercise to be worth the time. Even in the US I've found carbonated water at $0,10 a liter.
>
>This is $100 for the m³ ? Bit expensive. I pay EUR 2,14/m³.

That's about 10x over what I pay here, but it's not carbonated :). Got some interesting minerals, though, including iron and traces of arsenic. The latter was declared unsafe after only about 100 years of use, to the tune beloved by sellers of bottled water. The filtration unit would cost only half of what the people in the city spend each year for bottled water... which means there will never be enough money for it :).