I totally do this, too! Recently, I left a fantastic (and somewhat pricey) bottle of red on my counter, thinking I'd use the rest of it for drinking or cooking. I left for a trip/totally forgot about the wine and came back to what was essentially a bottle of unusable vinegar (and wasted money). Curses!So, here's the deal: As a general rule, anything with sparkles will last one to three days after opening. Reds, rosés, and whites can survive up to five days. Whites and rosés should be stored in the fridge with a cork or wine stopper; reds in a cool, dark place with a cork or wine stopper.Here's another idea: Take the remaining wine and freeze it in an ice-cube tray! That way, the wine won't go bad and you can pop out a wine cube when you're cooking or throw some wine cubes in with your white or rosé to keep it cold. Is that super genius or what?! Red-wine ice cubes would also be great to keep homemade sangria nice and cold, without watering it down.Or, if you want to be super on-trend, you can also turn your leftover wine into wine slushies . Cheers!