I watched a program once, and the answer to your question is simple. Bottled water comes straight from the mountains, but as with tap water..tap water contains urine, but has been mechanically cleaned.
Tap water will not make you ill, it is cheaper, so you may as well just drink it, enough people do!!
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It depends really, some bottled water is just a more pure tap. Some include vitamins that may not be found in tap water. Honestly, one should just buy a water purifier that can be mounted to ones sink. The filter will clean about as much gunk out of the water as their industrial filters, also it is more environmentally and financially less straining. (Less plastic to take up space in landfills, and it's cheaper.)
No because of all the STUPID chemicals.
Plastic bottles constantly deteriorate, the chemicals given off gradually mixing with the water in the bottles. Plastic water bottles that have been stored in a refrigerator or freezer apparently give off even more chemicals than plastic bottles that have been continually at room temperature. People that feel a need to constantly carry a container of water with them would drink safer water if it was stored in a glass container. Much of the bottled water sold in stores is simply bottled tap water, and there is no assurance that any bottled water is free of contaminants.
That depends on your location (where your tap water is coming from) and the source of the bottled water.
Aside: I once lived in a place where my tap water and the local popular bottled water came from the same place. Bottled water comes from a tap somewhere!
Tap water has chlorine and various metals in it. Filtered water has all those things filtered out. It is my opinion that bottled water is better than tap water. It is all I ever drink.