If you often drink mint tea or use mint in your recipes, consider growing your own mint plants instead of always buying a plant or tea bag at the supermarket. There's really nothing difficult to it. Below there is a "mint growing"-guide explaining all the steps you need to follow.
To have more fresh mint leaves, you can grow several plants at a time but don't take leaves for your mint tea before your plants have grown large enough. Otherwise, you will quickly run out of mint leaves.
2- Plant your mother plant in a larger pot
3- Care for your mother plant: give it enough light and water
4- Cut off a sprig and put it in a glass of water
5- Wait, wait, wait...The roots should grow.
6- Plant your new plant in a pot
7- Now, you can drink minty tea
8- At last, don't forget to repot your plant each year
Reference: http://www.patrickdepinguin.com/mint/howtogrow/
For more information about how to take care of your mint plant, you chose for you this website
http://www.mountainvalleygrowers.com/mintcareandtips.htm