Choose Flat Mirror map for in Material/Map browser as the Reflection Map.
In the "Render" group of the Flat Mirror Parameters check "Apply to Faces with ID = 1". In the Distortion group, choose "Use Bump Map" option and set the Distortion Amount = 1.5. Assign this material to the Box (water surface). This is our Water material.
Now press F10 to open the Render Scene dialogue box. In the Render Scene dialogue box, check "Force 2-Sided" option in the "Options" group of the Common Parameters roll-out. Click Render. That's all.
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