Because of its high acidity, vinegar is self-preserving and has an almost indefinite shelf life. The Vinegar Institute confirms that vinegar stays safe to use forever. While it may become cloudy or develop a “Mother” over time, it does not “spoil” in a way that makes it dangerous and white distilled vinegar stays exactly the same for decades.For the best flavor in cooking, try to use fruit-based vinegars (like Apple Cider or Champagne) within 2 years, but if you’re like me those varieties are used up in months in recipes and beverages.