Using this Whiskas cat food is easy. Just open the single - serve pack and serve it to your cat right away. For the best taste and freshness, make sure to use the whole pack in one go as the food may not stay as fresh once opened. Keep the unopened packs in a cool, dry place away from direct sunlight. There's no need for any special maintenance. If your cat doesn't finish the meal immediately, it's okay, but try to remove the uneaten part after a short while to keep things clean.