How long can a bottle of ketchup stay in your fridge before it goes bad? How long can a piece of apple be kept in the open before it turns dark? If you have any such questions in your mind, go to STILLTASTY.COM
This site lists all kinds of food and how to keep them fresh longer as well as how to get rid of them. If you have a question click on the particular picture and a whole list of stuff appears.
A very useful site for homemakers.