Most water companies that bottle water use tap water (municipal water), or below standard water. The reason why you think it tastes better is because of the placebo effect of expecting it to taste better. Here's a Penn and Teller bit on it (there's a bit of swearing, but not much).
Here if you bottle tap water you can't sell it as "mineral water" only natural source water can get that appellation. Nobody is going to spend money on some crappy bottled water. As I have said in others answers, I mainly buy bottled water for carbonated water.
Most water companies that bottle water use tap water (municipal water), or below standard water. The reason why you think it tastes better is because of the placebo effect of expecting it to taste better. Here's a Penn and Teller bit on it (there's a bit of swearing, but not much).
Here if you bottle tap water you can't sell it as "mineral water" only natural source water can get that appellation. Nobody is going to spend money on some crappy bottled water. As I have said in others answers, I mainly buy bottled water for carbonated water.
Mineral water is indeed different. It still can be found to be below standards, as regulations are rather lenient around the world.