Yes, you can use aluminum foil as a makeshift surface for making pizza if you don't have a pizza stone or baking sheet. However, it may not provide the same even heat distribution or crispiness as a pizza stone. Ensure the foil is heavy-duty to prevent tearing and preheat it with the oven to get a better result. Keep in mind that the foil can reflect heat, which might affect the bottom crust's texture. It's a good alternative, but for consistent quality, using a proper pizza stone or baking sheet is recommended.