What do you do with half a bottle of wine? There are so many preservation systems available, from pumps that suck air out to canisters that spray gas in, but the best preservation system of all is one of the cheapest, a 375ml ice wine bottle. If you think you are only going to drink two glasses, pour half the bottle into an old (clean) 375ml dessert wine bottle and cork it. The tall, narrow shape provides the smallest surface area for oxygen exchange. To save a little bit more, a 500ml Port bottle is perfect, and sometimes comes with a cork made for multiple uses.