Cauliflower rice is at its best when it's hot and soft. However, you can store leftovers in an airtight container in the fridge for up to four days. To serve, reheat the cauliflower rice on the stove or in the microwave in 30-second intervals until softened. If necessary, add a dash of more milk, cream, or water to help loosen it up. You can store leftover shrimp in an airtight container for 3 to 4 days.