In a large bowl, combine the rinsed rice and water. Let it soak for at least 3 hours or overnight.

Drain the rice and place it in a blender with 4 cups of fresh water. Blend until the rice is finely ground.

Strain the blended mixture through a fine mesh strainer or cheesecloth into a pitcher, discarding the solids.

To the strained liquid, add the milk, sugar, cinnamon, vanilla extract, and salt. Stir well until the sugar is dissolved.

Refrigerate for at least 1 hour before serving. Serve over ice and garnish with a sprinkle of cinnamon.