I barely used potions on my playthrough (completed it today, yay), I didn't like how short their durations were.
For the that area I mostly used haste spells to counter the slow effect and the Geomancer shield spell (Earth Shield? I forget the name) for the hefty poison resist and bonus hitpoint pool. They're short durations too (everything is

), but I felt they gave more bang for my action point bucks.
Also might be worth returning at a later level depending when you're tackling it - I first encountered that area around level 11 (I thought the mines were in there) and trying to fight through it at that level was a major slog.
Which one's Rapture? Is that the ranger charm spell? If so, sure, I've had it work. You'll want to either have very high dex or debuff the target's willpower for anything close to consistent success with it though.