Hello ,
Thank you for posting in the community and while I understand it's taking significant amount of time, we are working toward implementing support of water with Path Tracer. Here is the feature on the road-map and invite you to provide feedback if any:
https://portal.productboard.com/7pu88c9kpmqtzt8hwg6arujh/c/1030-path-tracer-improvements
Kind regards,
Vincent B.