While it is technically possible to shape aluminum foil into a container, it is not recommended for storing liquids like milk or juice. Aluminum foil is not designed for long-term storage of food or beverages as it can react with acidic substances, potentially leaching aluminum into the liquid. It is also not airtight, which means it won't keep the contents fresh. Instead, use containers specifically designed for food storage, such as glass or food-grade plastic containers with tight seals.