Does anyone know how you would go about creating a giant wall of water, such as the one seen in Interstellar?
For something like that you could use a plane with an ocean modifier. Here’s a quick tutorial that helped me with that. If you want to have other objects float on it, here’s another tutorial: https://www.youtube.com/watch?v=0GnMk8v4U78
In addition to Sufy_Isma’s links you may want to consider Create Large Scale Oceans in Blender 2.8 - YouTube