jiahu wine

How do you store wine after opening?

I want to start drinking a glass of wine a day and my favorite wine is Pinot Noir. So, what is a good way to store it after it’s opened? I know your not supposed to put red wine in the fridge and honestly cold pinot doesn’t sound appealing. I figure if I drink a generous sized glass every day then it would take me three to four days to finish a bottle. Would the wine be bad by the fourth day?