You Make At Home You Can Do This Non-GMO Gluten Free We Make It Easy. All You Need to Grow Healthy! Real Sour Cream Make fresh and natural sour cream in your own kitchen. Then, try your hand at a wide range of dishes, from dressings and dips to cakes. Eat healthy to stay healthy; our sour cream starter culture contains probiotic bacteria to boost your immune system. Sour cream is ready in a day and stays fresh in the fridge for up to 2 weeks. Each of the 4 starter packets makes up to 4 quarts.