Now I can’t give a full answer since I would like to know myself but I came across this guy on Artstation, [James Stone][1]
He does some awesome water shaders with a physics based flow system in a branching river. I gave him a message but haven’t received a response yet. Will keep you updated if he does and post it for future people. But he has them on the unreal marketplace if anyone is interested.
If you found an answer, I’d love to hear it as well, and anyone else watching this question for future use.