Attached Link: http://sites.google.com/site/bagginsbill/free-stuff/environment-sphere

As IsaoShi was suggesting, water, glass, gemstones, shiny metals all need surrounding surfaces to reflect off of. You could go get Bagginsbill's Evosphere and place it in your scene with an image of your choice. This will give your water plane a 360 degree environment to reflect off of.

A screenshot of your shader tree would be good so we can comment further and get your going along better toward the effect you are wanting.

"A lonely climber walks a tightrope to where dreams are born and never die!" - Billy Thorpe, song: Edge of Madness, album: East of Eden's Gate

Weapons of choice:

Poser Pro 2012, SR2, Paintshop Pro 8