If you cannot drink tap water ? the most ecological ? then spring-water is a good option, because it is very close to tap water, from the point of view of its ingredients (minerals?) What's more, the list of requirements is more strict for spring-water than it is for rock-water, which is often too mineralised, which can be unhealthy. By the way, it is advised that bottled water drinkers should regularly change water types and brands.
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