As all of my friends and many of my readers know, I'm vehemently opposed to bottled waters.  For those of us with clean, safe water flowing from the tap, bottled water is an economic and environmental waste of the most egregious variety. And while I have succumbed on rare occasion to purchasing a bottle of plain or still water (mostly when I've been caught traveling without myKor One Hydration Vessel), I do buy sparkling mineral water, which offers two benefits not commonly found in plain tap water: trace minerals, and carbonation.  I should probably get a SodaStream (I've been considering one for a while, but my tiny apartment doesn't really have the room for another small kitchen appliance), but in the mean time, I have a decided preference for Gerolsteiner.  Imported from Germany (mea culpa! – at least I always return/recycle the bottles), Gerolsteiner is particularly mineral-y, with a naturally high percentage of calcium, magnesium and bicarbonate, and a higher ratio of those minerals to sodium — much more so than the more commonplace Perrier, Pellegrino or 365 Everyday Italian Sparkling mineral water I would otherwise buy at Whole Foods.  And when you buy it by the case at Whole Foods, it's just $1.34/liter.