The fluid is rendered with a raymarching method using stepmarching + Image Base Lighting to grab the environment lighting.
The reflection is also using raymarching but this time the ray direction is the reflection of my direction with the WorldNormal.
The shadow is also using Raymaching + Image Base Lighting where I'm sampling linearly based on the Normal.
Finally, I've been using the Velocity of the Simulation (here done in Blueprint + RenderTarget) in order to create 3D Motion Blur to smooth the image toward the Velocity.
Everything here is rendered with the Movie Render Queue