If you have seen the sky turn green due to an approaching tornado, you might be a redneck.

http://www.usatoday.com/weather/resources/basics/green-thunderstorms.htm

I know, in many cases our teachers appologise for teaching us lies, but they have to. However, water is still colourless, it has no colour.  If it is pure, it has no colour. It is a completely different question if it is not pure, but it completely colourless

^^ water is never pure, there will always be mollecules of other substances in it, even bottled water has minerals and a whole other mess of stuff in it.

Not if it's bottled distilled water.  That's about as pure as you'd get.

There is still other particles of minerals in that too, it makes it healthier so taking them out would be stupid.

If the water you have is colorless, you don't have enough of it.  When you have enough water (pure or not) you can see its color.  You do know that so called clear glass is generally greenish in color, but if you make a thin wafer of this glass , it will look clear.  Take the same glass and form a giant block of it, and suddenly you will start to see the greenish tinge.

Do you even know what distilled means?  Distillation of water involves boiling the water, then taking the steam and condensing it in a seperate container.  All minerals will be left back in the original container as residue.  Distilled water is not meant for drinking precisely because it has no minerals.  It is meant to be used when highly purified water is necessary for uses like decontamination.  If you drink too much distilled water, you die.

http://www.mercola.com/article/water/distilled_water.htm

From Wiki - "Distillation Gathering water through the use of a bag is a much employed survival technique Gathering water through the use of a pit is another much employed survival technique Distilled water has virtually all of its impurities removed through distillation. Distillation involves boiling the water and then condensing the steam into a clean cup, leaving nearly all of the solid contaminants behind. Distillation produces very pure water but also leaves behind a leftover white or yellowish mineral scale, which requires that the distillation apparatus be frequently cleaned." notice the use of "virtualy"

The following are excerpts (A passage or segment taken from a longer work, such as a literary or musical composition, a document, or a film) from a peer reviewed scientific journal on the details of how water is vibrationally coloured.  The vibrations of which are photon (light) induced.

Charles L. Braun and Sergei N. Smirnov
Department of Chemistry
Dartmouth College, Hanover, NH 03755

"Water owes its intrinsic blueness to selective absorption in the red part of its visible spectrum. The absorbed photons promote transitions to high overtone and combination states of the nuclear motions of the molecule, i.e. to highly excited vibrations. To our knowledge the intrinsic blueness of water is the only example from nature in which color originates from vibrational transitions. Other materials owe their colors to the interaction of visible light with the electrons of the substances. Their colors may originate from resonant interactions between photons and matter such as absorption, emission, and selective reflection or from non-resonant processes such as Rayleigh scattering, interference, diffraction, or refraction, but in each case, the photons interact primarily or exclusively with electrons."

"Laboratory observation of the vibrational transitions that give water its color requires only simple equipment. Figure 1 gives the visible and near IR spectrum of H₂O at room temperature recorded using a Perkin Elmer Lambda 9 Spectrophotometer and a 10 cm quartz cell filled with "nanopure" water from an ion exchange apparatus manufactured by Barnstead. Lower purity, distilled water gave an almost identical spectrum. The absorption below 700 nm in wavelength contributes to the color of water. This absorption consists of the short wavelength tail of a band centered at 760 nm and two weaker bands at 660 and 605 nm. The vibrational origin of this visible absorption of H₂O is demonstrated in Figure 1 by the spectrum of D₂O recorded in the same 10 cm cell. D₂O is colorless because all of its corresponding vibrational transitions are shifted to lower energy by the increase in isotope mass. For example the H₂O band at 760 nm is shifted to approximately 1000 nm in D₂O (See Fig. 1)."

***** side note: Deuterium is a stable isotope of hydrogen.  The nucleus of deuterium, called a deuteron, contains one proton and one neutron, whereas the far more common hydrogen nucleus contains no neutrons.

"The blue color of water may be easily seen with the naked eye by looking through a long tube filled with purified water. We used a 3 m long by 4 cm diameter length of aluminum tubing with a Plexiglass window epoxied to one end of the tube. Ten or more observers each reported seeing a blue color when they looked through the tube and observed a sunlight-illuminated white paper placed below the vertically-suspended tube.  This observation is in accord with the spectrum of H₂O recorded in Fig. 1. For example, from the measured absorbance at 660 nm, the calculated transmission of a 3 m water-filled tube is 44% -- a loss of red intensity that should be perceptible. Light transmitted through the empty cell was white. The large tube volume and a limited budget precluded checking to see if light transmitted through a D₂O filled tube was indeed white, as expected."

H2O tube on left     D2O tube on right

I leave out all the details on the mechanism and their further tests due to the fact that I believe that less than 1% of the people here will be able to read and understand it.  Conclusions should not be drawn from the previous excerpts of text unless you have reproduced the experiments and their results yourself.

Your making this more complicated than it is lol you are saying that pure water is blue in a fancy way, its blue because it reflects blue light, this is how all colours are created, except black which doesnt reflect light it absorbs it and thats why darker colours heat up more in in light. and it doesnt have to be sunlight to reflect the colour.