Use flavorings such as sprigs of fresh herbs, peppercorns, fresh chiles and cloves of garlic. Use a vinegar such as white or red wine, cider, champagne, sherry or rice-wine vinegar. Use a chopstick or skewer to poke desired flavorings into a sterilized bottle. Experiment with different combinations and amounts. Add vinegar to fill, using a funnel. Cork or seal bottles and store in a cool, dry place for at least a week to allow flavors to blend.
Store at room temperature. Keep covered and refrigerated. Shake before using.