Proper storage and maintenance of your liquors and mixers can extend their shelf life and preserve their quality. Unopened bottles of spirits are stable and can be stored for many years. Once opened, they should ideally be consumed within 1-2 years. Store spirits in a cool, dark place, upright, to prevent the alcohol from breaking down the cork. Liqueurs should be stored similarly, but keep in mind they have a shorter shelf life due to their sugar content. Vermouth and other wine-based aperitifs should be refrigerated after opening and consumed within 1-2 weeks. Mixers, too, should be refrigerated after opening and used within the recommended timeframe on the label. Fresh ingredients like lemons, limes, and herbs should be bought regularly to ensure they are always fresh when used in your drinks.