Combine all ingredients in the slow cooker. Cover with water. It's okay if not everything is fully submerged. Cook on low for 8 hours.After the stock is done cooking, remove all the bones and vegetables with tongs or a fine mesh skimmer. Pour the stock through a fine mesh strainer and into a large bowl. For a cleaner, clearer stock, clean out your strainer, and line with a cheesecloth, and strain the stock again or line your bowl directly with cheesecloth.Divide the stock between several mason jars or storage containers. Cool completely, then cover and refrigerate for up to a week, or freeze for up to 3 months. Makes about 6 - 6½ cups stock.