Someone might have better suggestions, but you don't need alchemy skills to buy out the elixir consignment store -- probably just spending a few hours there and "flipping it" might work. There's zombification and the potent form - the weaker one only lasts for 6 hours or so I believe, and the other one, you'll need a potent cure elixir or a sunlight charm to fix (maybe just a cure one would work too?)