Bring 4 of the 8 cups of water with the cinnamon stick to a boil. Once it starts boiling, turn off the heat, remove the water from the burner, and add the rice. Give the rice a quick stir and let it sit for 30-40 minutes to soak.

In a large pitcher, combine the condensed milk with the remaining 4 cups of water. Stir well, set aside.

After 30 or 40 minutes, pour the water with rice and cinnamon stick into the blender and blend for at least a minute, or until the rice and cinnamon resemble a coarse sandy texture. Add the remaining water with condensed milk to the blender. Blend again to combine well. Pour all the rice water through a strainer into a wide mouthed pitcher or large bowl.

At this point you can taste it to see if it’s sweet enough for you. To make it sweeter, you can either add more condensed sweetened milk, or regular sugar. Give everything a GOOD stir, and serve on the rocks!