actually most bottle water is tap water treated with reverse osmosis.
I think in this case it's just natural spring water, as the label says.
The label states 45 PPM of Bicarbonate, 19 PPM Calcium, 8 PPM Chlorine, with the rest being too low for me to care.
Must just be the minerals and crap I am tasting, so hopefully this is better than from the tap.
Next time I will use reverse osmosis water.