In a blender, add uncooked rice and water. Blend on the high-speed setting until it breaks up roughly and the water is white and cloudy. Set aside in the fridge overnight in a sealed container.
The next day, stir the rice mixture, pour the rice mixture into a fine-mesh strainer over a mixing bowl. Discard the rice in the mesh.
In the mixing bowl, stir in almond milk, vanilla extract, cinnamon, and sugar. You can blend again for a few seconds to combine the sugar into the milk. Adjust the sugar to taste. I used 1/3 cup for a low-sugar drink. Add up to 2/3 cup of sugar.
Transfer to a pitcher and store in the fridge until time to serve.
Give a good stir in the pitcher before serving and serve over ice cubes with a stick of cinnamon.