There is no replacement for homemade chicken stock.But you can make store-bought stock taste a lot better by using this method:.Pour a box of stock into a saucepan, and add a minced carrot, a minced celery stalk, peppercorns, and chopped onion.Then, just let that simmer for a while.There is no recipe or specific timing. When the stock tastes good, strain the solids out, and you're good to go.