The chicken can be prepared a day or two before: 1 chicken, quartered, seasoned, boiled, cooled and shredded. You can even use leftover chicken if the flavor is natural or mild. If you can't find dry epazote you can substitute for fresh, but double the amount. If you can't find epazote, you can omit or even change to something like parsley or another earthy herb. Always check the seasoning before serving.