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.
4. Brewing iced tea at an appropriate temperature in a thoroughly cleaned urn and limiting the time held at room temperature before serving will minimize the theoretical risk of bacterial contamination. Recommendations for Iced Tea Safety. * Iced tea sould be brewed at 195 F for 3-5 minutes.* Iced tea should be stored for no longer than 8 hours. * The tea brewer, storage dispenser, and faucet should be cleaned daily.The CDC stated that redesigning tea dispensers to be more easily dismantled and cleaned could further reduce the theoretical risk of bacterial contamination of iced tea. Iced tea should be stored for no longer than 8 hours. * The tea brewer, storage dispenser, and faucet should be cleaned daily. The CDC stated that redesigning tea dispensers to be more easily dismantled and cleaned could further reduce the theoretical risk of bacterial contamination of iced tea.