Well according to Victor Schauberger (from the book called Hidden Nature)
The qualities of different waters
Although good water is tasteless, without colour or smell, it
quenches our thirst like nothing else. In order to be healthy, we need
to drink, according to some authorities, 1-2 litres (5-9 pints) of
good quality water a day. Some types of water are more suitable for
drinking than others. In Chapter 12 we shall consider some of the
choices we have of improving the quality of the available water
before we drink it. High quality water should contain elements of
both geospheric (female) and atmospheric (male).
Considered physically and chemically to be the purest form of
water. Its nature is to extract or attract to itself all the substances it
needs to become mature itself, and therefore absorbs everything
within reach. Such water is really quite dangerous if drunk continuously
long-term. The 'Kneipp cure' uses distilled water for its
short-term therapeutic effect, where it acts to purge the body of
excessive deposits of particular substances.
If it has not been affected by industrial pollution (acid rain), rainwater
is the purest naturally available water. Slightly richer through
the absorption of atmospheric gases, it is still unsuitable for drinking
in the long term. When drunk as melted snow-water, it also gives
rise to certain deficiencies and if no other water is available it can
on occasion result in goitre, the enlargement of the thyroid gland.
Juvenile water is immature water from deep underground sources,
like geysers. It has not mellowed sufficiently on its passage through
the ground. It has not developed a mature structure and contains
some minerals (geospheric elements), but few gases (atmospheric
elements), so as drinking water it is not very high grade (cf most spa
waters which arise from mineral rich depths).
Water from dams and reservoirs contain some minerals and salts
absorbed through contact with the soil and the atmosphere. Its
quality deteriorates through exposure to the Sun, to excessive
warming and to chemicals and other pollutants. Although most
urban communities now depend on this source, generally speaking
it is not good quality water.
Groundwater has a higher quality due to a larger amount of dissolved
carbons and other trace salts. This is water emanating from
lower levels, seeping out at the surface after passage along an impervious
rock surface. Often this is now polluted by the chemicals of
True spring water has a large amount of dissolved carbons and minerals.
Its high quality is often shown by its shimmering, vibrant
bluish colour. The product of infiltrating rainwater (full complement
of atmospheric gases) and geospheric water (full complement
of minerals, salts and trace elements), this is the best water for
drinking, and it often retains this quality in the upper reaches of a
mountain stream. Commercially bottled 'springwater' is unfortunately
not always of the best quality — many are not from true
springs — even if it is bottled in glass rather than the plastic which
impairs its quality.
Artesian water is obtained from boreholes and is of unpredictable
quality. It may be saline, brackish, or fresh. Water from wells can
vary from good to poor, depending on how deep is the well and what
stratum of water is tapped, and they can be polluted by nitrates
In the final, the best water will come out from the water filter like the ones from http://www.alivewater.net
or anything that uses the Victor Schauberger principles in filtering and reenergizing the water.