As an explosive diarrhea outbreak splatters across the country, Taco Bell is preparing for the worst. This week, the fast food chain — or at least its locations in Michigan — began temporarily pulling some of its staple ingredients to help stop the spread of cyclosporiasis, a foodborne parasite that causes sufferers to go running to the toilet even more often than a standard Taco Bell meal might. Many of your favorite menu items, like the Crunch…