Storing wine that has been opened

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What makes wine go bad once it is open is oxygen and heat. Definitely keep it in the fridge, and a great trick to replace expensive "wine preserving gadgets" is to breathe (blow) into the bottle until you feel your breath come back at you. Of course we exhale carbon dioxide, which replaces the oxygen and thus slows spoilage. But the best trick is to drink it within a few days.