I'm biased, but I would always do this type of thing in your compositor.
-always have more control
If you MUST do it in 3d, then have you tried applying and tweaking one of the fluids presets?
There should be a few in there that will give you a great start.
If you are not sure how to do it in post, lemme know
Israel "Izzy" Long
Motion and Title Design for Broadcast-Film-DS