The crazy thing about Fiji water is that it is actually bottled in Fiji and shipped around the world. So now even plain potable water can have a significant carbon footprint.
I dislike the idea of drinking water that has been circulating through pipes and filters in the city for decades, including through our toilets and showers and huge amounts of chemical waste. Of course, the methods have completely purified the water, but claims that tap water still isn't good are attributed to the sort of last mile dirty pipe system, which is solved by more filtering.
I like the idea of nature filtering the water that I drink. That's why I like the idea of water springs. I would be less interested in spring water that still just comes from municipal water supplies that similarly recycles the water, and would prefer it coming directly from a spring.