I recall doing a science project in middle school where I did double-blind taste tests of tap water with a half-dozen brands of bottled water (in a place with d

I recall doing a science project in middle school where I did double-blind taste tests of tap water with a half-dozen brands of bottled water (in a place with decent-tasting tap water, FWIW). IIRC, people showed no statistically significant preference for Evian or other fancy bottled water over the local tap water. That isn't to say that there's no taste difference, but that preferring a specific brand of bottled water is likely to be much more about the subconscious effect of marketing than something a priori more enjoyable about the mineral content of a specific brand.