The old Turbulence mode is however only supported in A6. It also works in A7 when you compile the level for A6, i.e. with "Create Meshes" unchecked. But this is not recommended. You can't use the cool A7 features then.
In A7, use a water terrain with one of the water shaders that you can preview with the Shader Viewer. There's also a shader that simulates the old turbulence effect.