original: Ensuring that the food supply is free of contamination.
simplifications: Ensure that the food supply is free of contamination. Making sure that food supply is not poisoned. Making sure the food supply isn't contaminated. Ensuring that the food supply is not contaminated. Making certain the food supply has no contamination. Making sure the food supply stays pure. Making sure that the food supply is free of contamination. They made sure that the food supply is free of contamination. It ensures that the food supply is not contaminated. Ensure that the food supply is free of unclean