As an expert sommelier and brewer, I can confidently say that whiskey does not go bad when left unopened. This is because whiskey, unlike wine or beer, does not continue to age or develop in the bottle. Once it has been distilled and bottled, the aging process essentially stops. Therefore, an unopened bottle of whiskey can last indefinitely if stored in the proper conditions.
When it comes to storing whiskey, there are a few key factors to consider. First and foremost, it is important to keep the bottle upright to prevent any leakage or evaporation. Additionally, it is crucial to store the whiskey in a cool, dark place, away from direct sunlight and extreme temperatures. Exposure to heat and light can cause the whiskey to deteriorate and lose its quality over time.
While an unopened bottle of whiskey may not go bad, it is worth noting that the flavor and character of the whiskey can change over an extended period. This is due to the interaction between the liquid and the air trapped in the bottle. The longer the bottle remains unopened, the greater the chance for subtle changes in flavor and aroma.
Now, let's discuss the situation once the bottle is opened. Once the seal is broken, the whiskey is exposed to oxygen, which can gradually impact its flavor profile. This process is known as oxidation. While some whiskies may benefit from a little bit of oxidation, as it can help to open up the flavors and aromas, excessive exposure to air can lead to a degradation of the whiskey's qualities.
Typically, an opened bottle of whiskey will remain drinkable for a couple of years. However, the rate at which it deteriorates can vary depending on several factors, such as the quality of the whiskey, the amount of air in the bottle, and how well it is resealed after each use. It is worth noting that higher-proof whiskies tend to have a longer shelf life than lower-proof ones.
To prolong the lifespan of an opened bottle of whiskey, there are a few steps you can take. Firstly, always make sure to tightly seal the bottle after each use. This will help minimize the whiskey's exposure to air and slow down the oxidation process. Additionally, storing the bottle in a cool, dark place can further help preserve its quality.
In my personal experience, I have encountered opened bottles of whiskey that have remained enjoyable for several years. However, I have also come across bottles that have noticeably declined in flavor after just a few months. This highlights the importance of paying attention to the condition of the whiskey and trusting your own senses when determining its drinkability.
An unopened bottle of whiskey does not go bad and can last indefinitely if stored properly. However, once the bottle is opened, the whiskey's flavor and quality can gradually deteriorate over time due to oxidation. While an opened bottle of whiskey can remain drinkable for a couple of years, it is best to consume it within six months to two years to fully enjoy its intended flavor profile.