I am doing a basement bathroom (see my other thread on my tiling saga).....

This bathroom wil be connected to the existing finished basment area.

My question is regarding a vapor barrier for the bathroom wall that is on the poured foundation wall....
Do I need some plastic sheeting as a vapor/water barrier between the concrete and insulation/wall studs?

Or am I good with just the wall, insulation and wall studs?
Do I use just regular pink insulation with the paper on one side?

If I need a plastic sheeting vapor barrier, how do I attach it? Where?

Not usre if it matters, but the wall has a coat of DryLock or similar on it.....I think it was done by the previous homeowners, at least 6 years ago....