Transfer it to a large jar and add the almonds, cinnamon sticks, and ground cinnamon. Add the 2 cups of water and mix.
At the end of these 8 hours, remove the cinnamon sticks and pour the rice mixture into a blender.
Place a fine mesh strainer on a deep salad bowl and cover with 2 layers of damp cheesecloth.
Add 2 cups of cold water to the mixture and continue stirring gently.
Add the remaining cup of cold water and the sugar. Mix well with a hand blender.