As an industrial and municipal water treatment consultant I just had to chime in. RO and DI water are fine to drink, they just taste flat. Your body does not rely on minerals in water for nutrition. A single piece of toast has many times the number of minerals several gallons of water has.
RO is used all over the world to produce fresh drinking water from seawater. Many of the bottled water companies use RO pretreatment.
GVRD water has the lowest concentration of dissolved minerals in North America. The need for RO here is marginal at best.
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