Human: How do I make my own reusable coffee cup? Assistant: 
To make your own reusable coffee cup, you will need a few supplies. You will need to find a thermos or insulated mug that is large enough for your desired size of coffee and has a lid. You may also want to look for one with a handle so it's easier to carry around. Next, you'll need some sort of filter material such as cotton, paper towels, or even a metal mesh strainer. Finally, you will need a way to secure the filter in place inside the cup. This can be done by using a rubber band, string, or other method. Once all these materials are gathered, you can start brewing your favorite brew!