I was bored and I decided to make this since I recall there was a water world preset for 1.12.2 and tried to implement it with the new export options, which didn't work. So I decided to make it with the 1.16.2 generation features.
Anyways the only biomes in the datapack are oceans and beaches.
If there are any issues with the datapack please comment down in the comment section since this is my first time doing this type of thing :).