Many of us understand that when it comes to a cold or the flu, we're most contagious before we start feeling sick; that by the time we've got a runny nose, sore throat and achy muscles, the damage to the people around us has already been done. In fact, many of us are completely wrong.
Immediately refrigerate leftover canned tuna in a glass or plastic container. Do not leave the tuna in the opened can, as it may become rusty once open. You can refrigerate canned tuna in a tightly covered container for up to two days. If you are storing your canned tuna in an unheated garage, ensure that it does not freeze during the winter months. This can cause the can to bulge or rust.
Keep these guidelines* in mind while cleaning out your fridge and pantry. Unopened, most of these items can be kept in their original packaging in the pantry at room temperature for at least 1 year. (Exceptions are noted below.) Once open, they should be stored in the refrigerator. However, some staples, like olive and vegetable oils, vinegar, and hot sauce, can stay at room temperature (see details below).