This mod is a bit strange.
It adds it's resource in final stage so it's a tad hard to replace it. So currently you get error message from RSO but water still spawns.
Also since it uses fluid resource and spawns it like ore I would need to add separate support for that.
It will remain unsupported for now I think.
I played around with it but I think you will need to take a look if it makes sense from balancing perspective.
I stayed with using fluid spawning mode and I think starting area is behaving strangely but outside seems pretty ok.
Please check it out in new RSO version and let me know.