You can use cinnamon, mace, allspice, cloves, peppercorns, mustard seed, garlic, dill, chili, ginger, or whatever you like. Put the bag of spices and vinegar in a jar, and put the jar in a pan of water. Bring the pan of water to a boil and then remove from heat and let cool. Remove the spice bag and the vinegar is ready to use. If you don't want to bother with spicing the vinegar yourself, you can buy already spiced vinegar or just use plain vinegar.
Cider vinegar gives a nice flavor.
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