The best way to use plastic wrap for cooking is to cover food for storage or to create a steaming environment. To store food, press the wrap directly onto the surface to minimize air exposure and prevent spoilage. For steaming, dampen the wrap slightly and loosely cover the dish, allowing steam to circulate while keeping in moisture. Always avoid direct contact with high heat or using plastic wrap in the microwave without proper guidelines, as some plastics can release harmful chemicals when heated.