The molecules of which foods are made are too large to pass through the lining of the digestive system. Digestion results in the formation of smaller molecules that are able to pass through that lining and enter the person's bloodstream. (for example,) Sugar molecules formed by the digestion of starch enter the bloodstream.
Either way, not worth the risk - you can get very ill from consuming or drinking expired products, including ice tea. Now if it is a best before date, that tells us something else. It says it has not turned or gone bad, but that it may not taste very fresh after the date on the bottle. There is a huge difference between the comments expired and best before - so please use caution and consider these points. For dry ice tea mix, you usually see a best before date.
Home > How to Store Brewed Tea. Once you store brewed tea in the refrigerator, you are essentially creating iced tea. The tea, whether black or green, should last for about two days in the fridge before it goes stale or flat. The Centers for Disease Control and Prevention recommends storing tea at room temperature for a maximum of eight hours.