Normal Reconstruction

Hello, I'm working on a water shader. I tried to reconstruct the normals but I wasn't able to do it using the provided example. Could You help me out?
Here is the link to the shader:
https://drive.google.com/file/d/1LOF1R8 ... sp=sharing
Btw it has 10Mb and I wasn't able to upload it as an attachment here for some reason.
Here is the link to the shader:
https://drive.google.com/file/d/1LOF1R8 ... sp=sharing
Btw it has 10Mb and I wasn't able to upload it as an attachment here for some reason.