I got so lucky with creating the water interactions! I managed to find a water interaction demo project made with unity 5! I loaded it up into my current version 2020.2b and managed to get it working with a few tweaks to the source code.
I chose a visual style that is easy for me to create completely by myself. So it had to be 3D for me to manage it alone and stylized low poly for faster production. Stylized 3D means no UV mapping, no LODs or no separate collision meshes. It is a win-win-win! And paired with modern rendering techniques, extreme low poly stuff can look amazing.