To make this Southern Strawberry Punch Cake gluten-free, simply substitute the regular white cake mix with a certified gluten-free white or vanilla cake mix. Double-check that your instant pudding mix is labeled gluten-free, and ensure that no cross-contaminated ingredients (such as whipped topping or canned pineapple) are used. With these substitutions, you can enjoy this delicious dessert without compromising your dietary needs.