Potions - Part 1: Unexpected Dilemmas

I hadn't thought about making potions much. But, as it turns out, I now have to work out a good system for doing so. Why? In my post on Thief's Bane I mention that it can be removed by soaking the afflicted body part in Cyterii and list what it's made of. So now anyone who's playing this knows (No-one that I know of, but I can hope, right?) that Darktainted Liza-grass, Ashen Hunterleaf, and Death's-touch Mushrooms can be turned into something. They'll be angry (and rightly so) if I say they can't make it. So what to do? I'll be working out a suitable process in a later post. If you have any ideas let me know!