to implement this shader to your project do the following:

1. Press file then select Append:

2. Choose H2O blend file and select materials:

3. Select H2O.

4. Have fun!

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Note: The Ocean modifier is needed for accurate water simulation and displacement, however, you can use the vanilla version of the shader with the default noise variations if you want a flat water surface. 

This product includes one main project/H2O.blend file contains the default shader & two different presets as separated .blend files including two 4k HDRIs.

...If you are a beginner feel free to ask me anything!

Recommended GPUs:

NVIDIA: GTX 1050TI/1060.. and above

AMD: Rx 470/480.. and above

of course, you still can use older GPUs with minor render times increase depending on the GPU used.