Add chicken stock and water to the pot and stir to release browned bits from the bottom of the pan. Add Sam's Cantina Style Salsa, 4 Tablespoons Sam's Salsa Verde, and oregano. Return pork to the pot and bring to a boil stirring occasionally. Reduce heat and simmer partially covered for 2 ½ - 3 hours. Stir the sauce several times during cooking. The sauce will be quite thick. More water can be added to achieve desired constancy.