saline vs. peptone water - (Mar/25/2009 )

I do think that there are microbes that can grow in saline, maybe just that they are not nearby us in the lab... and the common agar plates that we use not suitable for their growth.

And some of the pseudomonads grow in odistilled water. Your question appeared to be about serial dilution for plating.
Again - be a scientist - if you have a question abut a particular bug - run the experiment.