Pour the rice and 2 cups water in a blender. Blend until the rice begins to break up, about 1 minute. Add the last 3 cups of water and blend for an additional 30 seconds. Let rice and water sit on counter for anywhere from 3+ hours.

Strain the rice water into a large pitcher and throw away the rice. Stir the cinnamon sticks, sugar, milk and vanilla into the rice water. Chill. When thoroughly chilled, stir up and pour over ice. So refreshing and delicious!