Is it possible to create a version for the basic render pipe?
Viewing post in PSX Water Shader - Unity URP comments
To create this I used ShaderGraph which is exclusive to the scriptable render pipelines (HDRP & URP). So, sadly, for this specific implementation its not possible. However, there already exists a psx unity water asset here on itch.io for the Built-In Render Pipeline (BiRP). I'd grab that one if you're using BiRP.