Yes, it can. You need to go to the spectrometer page for more information. It will show how to set up cuvette s to hold water and what to use as a light source. Then you need to go to the spectrometry page. You will need to learn to use spectralworkbench, but there are many examples of different colored water samples in the library. There are help videos showing how to use the software.
The old way to learn color was Roy G. Biv ( red orange yellow green blue indigo violet). You can see this in the picture taken by the diffraction grating. But it will be a good way to teach. Sorry for the delay answering.
Try to avoid using blue water solutions, at least without doing some testing. The compact florescent lamps (CFL) loose intensity at the blue and of the spectrum. The cfls are one lamp often used with the cuvettes for water testing. The intensity lose could be a problem.
Can you measure pure water? Probably so! While largely transparent in the visible water absorb in the 700-850nm range, note that to image in that range you will need an IR enabled camera as the IR blocking filter will block that range.
A great book with a short excerpt on this is Optics in the Air, it refers to two papers:
Pure water and The color of the pools at the Yellowstone National park