Unglow pills alone can be bought at Dr. Choppy's ( Greyfold eastside )or the Tribal market Don't know about Deradiation pills... (don't even think they exist...) You get the bunker location after talking with one of the 2 factions in greyfold (forgot thier names lol) after doing a couple missions they will say the other side needs to die so they send you to the bunker. Side note if you want both sides to live and be a good person talk to the lady in charge of the brothel :)