Stack 30 Penicillin In Your Dogs Bag, And Start A New Run. (Penicillin = Moldy Lump x2 At A Campfire)
---------------------------------
Then Start Chuggin The Base Camp's Polluted Water Until You Get Listeria Or Dysentery.
- Then Eat A Penicillin To Cure It.
Do This Until You Get The Achievement. (Might Take Longer Than You Want, But It's A Surefire Way To Do It.)
Good Luck!