- How long do diet soft drinks last once opened? The precise answer depends to a large extent on storage conditions — keep opened diet soft drinks refrigerated and tightly closed.
How long do diet soft drinks last in the refrigerator once opened? Diet soft drinks that have been continuously refrigerated will keep at best quality for about 1 to 4 days after opening.
Are opened diet soft drinks safe to drink after the "expiration" date on the bottle? Yes, provided they are properly stored and the bottle or can is undamaged - commercially packaged diet soft drinks will typically carry a " Best By," "Best if Used By," "Best Before", or "Best When Used By" date but this is not a safety date, it is the manufacturer's estimate of how long the diet soft drinks will remain at peak quality.
How can you tell if opened diet soft drinks are bad or spoiled? After opening, commercially manufactured diet soft drinks will start to become flat and lose flavor; if the diet soft drinks develop an off odor, flavor or appearance they should be discarded.
Discard all diet soft drinks from cans or bottles that are leaking, rusting, bulging or severely dented.
Sources: For details about data sources used for food storage information, please click here