How do I make two separate water elements?

Just started in Unity.

I want to put a small lake on an island surrounded by ocean. But when I try to edit the lake water it also affects the surrounding ocean water, even though they are two separate objects in the Hierarchy. How do I make these truly separate so I can manipulate them independently?

you need to make differant materials for them or else it will edit all water in that project even when you add it new as stated above ctrl+D then add one set to the lake and the other to the ocean, then edit the maerials they will work seperate then, but i recoment making 2 copys one for each and keeping the original as thats the defalt for new water