Dasani's uniquely terrible. IDK what they do to it, but it's awful (to me—apparently someone likes it). I've not had another name-brand non-super-cheap bottled water that was outright bad.
Every now and then I'll get a cheap gas station or local brand bottle of water (when traveling, say) and on the first sip it's like "yep, that's just not-very-good tap water, not even filtered". Other times it's fine, but it's pretty obvious the ones that just went with whatever the cheapest local source was and didn't do anything to it.
Dasani is owned by Coca Cola and is very much filtered. Taste could differ based on the source of water though. But I would be skeptical of being able to taste the difference if the source of water was the same.
That said there was a YouTube video about 4 years ago for bottled water in China. They tested like 8 Brand’s of bottled water and all contained stuff that could make you sick and the suggestion was to still boil water.
Every now and then I'll get a cheap gas station or local brand bottle of water (when traveling, say) and on the first sip it's like "yep, that's just not-very-good tap water, not even filtered". Other times it's fine, but it's pretty obvious the ones that just went with whatever the cheapest local source was and didn't do anything to it.