I often like to keep a bottle of red wine handy for adding to sauces while cooking. I made a casserole about two weeks ago using a bottle, and was thinking of making a bolognese tomorrow using a bit from the same bottle.
Is is OK or could I make myself and the rest of my family ill if I use it? Generally how long does red wine keep for cooking purposes once the bottle is opened?
IME, a bottle of red wine will go off (turn more acidic) in about half a week unless stopped with a vacuvin or similar. You won't get ill by using it, but it will be akin to pouring vinegar into your sauce, which might not be that appealing. If you wanted to keep small quantities of wine to use for cooking and don't have a bottle of wine in quick rotation, just freeze small quantities of wine to use later.