Soak the rice in two cups of the extremely hot but not boiling water for about two hours. The rice will still be in a basically raw state, but will be a little softened. If you tried to snap a piece of the rice in half with your fingers, you should still be able to do it after straining the water from the rice.
Strain the water from the rice.
In a blender or food processor (if you have access to modern appliances), or with a manual grain grinder if you do not, add in the rest of the water, the salt, and any optional flavorings. If using a blender then blend for 60 seconds. The rice particles do not have to be completely broken up.
If you prefer a 100% liquid milk, then blend for a bit longer.
Pour the rice milk mixture into a pitcher or another large bowl through cheesecloth, a fine mesh strainer, or even a clean cotton shirt. Do not use a nut milk bag for this recipe, as the openings are too large and will allow rice particles to filter through.