I don't think boneh3ad was trying to be rude. It was a genuine question on how low your idea (or requirement) of low compressibility is. Low compressibility could mean zero, or it could have been something fairly compressible, but not very much (which would exclude water).
Oooh! In that case I'm really sorry for the misunderstanding!
I think water is Ok for my case. As I was looking for a fluid that could be modeled as incompressible and also as a compressible fluid with modification to the incompressible fluid code, if needed.