Well, actually Outterra does not use water textures (excluding surf texture). The surface is all geometry/mesh with sort of sky/sun reflection.
Appearance of water color (and the somewhat too bluish tone) however can be altered via atmospheric settings in reducing beta rayleigh settings among others. Keep in mind that sky color is also affected.
A "sky reflection amount/tone" slider in water settings would be appreciated.
Concerning reflections, angrypig wrote, there will be screen space reflections implemented.