I faked the glass with glossy material spec:1, rough:0, IOR:1.0, and I put falloff map to opacity, to fake the fresnel effect. (the project was very big, and model came from not very clean sketchup, I didnt have time to do double glass for all windows in the model. It is useful for fast glass)
For water - specular material with light blue tranmision, IOR 1.33 and Turbulance in bump (for waves). To enhance reflections I mixed it with glossy material, spec:1, rough:0, IOR:1.0 and same turbulance map for bump. For amount I put fallof map.
2 x GTX 980 Ti, 32 GB ram, i7 5820K