What can I do to help make our food supply more safe?

Safe food. Buy mainly organic foods when possible. Wash fruits and vegetables well. Buy food from well known stores. Refrigerate foods properly. Google safe food supply for more answers.
Safe foods. Business people respond to market demands. It was just a few years ago when one can hardly find organic foods in the supermarkets. Not it is almost everywhere. Purchasing known organic products will send the message to the store owners which will be relayed to the suppliers. Economic principles will prevail in most situations.