blisterwort? it's the most common of the ingredients if you are looking to do any of the exploits with the smiting potions. The lady in whiterun always has like 6, there's some in the mages college too (mage quarters), or you can try to solitude shop.
Or, you can do the restoration potion which is faster and better than the one you are about to do.
You could just use the wait function in the game and wait 48 hours. As soon as you pick 24 hours, press A and immediately press the Guide button. Makes it go tons faster . --- I play Horde, have a mic, and am a team player. Invite! Level reset in Gears of War 3 --- GT: Xx Jkickit xX