If your experiments with forward shading, did you enable High Quality Reflections?
Another issue could bee that the Roughness of the water surface is too high so that no reflections show up. You can try to adjust the RoughnessMax and RoughnessMin parameters to make it more smooth. Before you do this, you might want to manually set the Roughness of the Water material to 0 as a test to see if the reflections show up.
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