I occasionally cook with a recipe that calls for a few tblsps of sherry. I run out, buy a bottle, and then a few months go by until I need to use it again. I have no plans to drink it so it just sits in the fridge until I need a few more spoonfuls. How long does a bottle keep in the fridge? If it isn't too long, what do you do in order to not have to buy a whole bottle every time you just need a bit of it?