I think that this is a controversial subject. Bottled water companies that claim to sell purified water or spring water are often just using the municipal water supply to fill up their bottles to sell. If you check the labels of most bottled water you will see that practically all brands contain fluoride. Fluoride is not naturally occurring in water, nor does it in the body. This is a subject of great debate and will not get into it here. I personally favor purity without municipal (or national) influence without a way to opt out.
Here are a couple of companies that deliver:
http://www.cimescent.../productos.html
http://www.vdsmovil.com.ar/
Regular filtration system:
http://www.psa.com.a...CFe4F7AodOCQAkw
The only way to remove fluoride and/or other impurities from water is a more expensive
REVERSE OSMOSIS FILTRATION, usually for institutional use, but available for domestic use. Here are a few I've found in Buenos Aires:
http://acquabio.com/...CFehj7AodhDkA8A
http://www.vitalwate.../productos.html