Freeze food in giant silicone ice cube trays! Space efficient in the freezer, never run out of containers, and defrost single portions.
Serious Eats Drinks Site Editor says that she freezes wine in ice cube trays and stores them in the freezer, ready to be pulled out one at a time and added to pan sauces and stews, saving you from having to open a whole bottle every time a recipe calls for some wine.
Similarly, if you make yourself a large batch of stock, freeze it in convenient portion sizes in the freezer—ice cube trays and half-pint deli containers are great for this—then transfer them to a plastic freezer bag to be pulled out an used whenever you need fresh stock.