Wine tastes best when it's shared and appreciated, right? But, a bottle isn't always finished during a meal (or more than one bottle, depending on the size of your dinner party). Just as connoisseurs know that a little oxygen brings out wine's true essences, it's also wine's worst enemy. Leave a bottle of wine improperly sealed, and down the drain it goes! Wine preservers help keep bottles of wine fresh for days, so you don't waste a drop of your favorite vintage.
There are a few different ways to preserve wine in the bottle. One of the more basic ways is to reseal the bottle with an airtight stopper. Go a step further, and you can buy a resealer that actually pumps much of the extra air out of the wine bottle, thwarting any oxygenation that can ruin the taste. A science lover might try argon cartridges or a nitrogen gas system that replaces the air with inert gasses that won't spoil your wine. Whatever you use, your palate will thank you -- and you won't be wasting any money by pouring that spoiled wine down the drain.