Bring the water to a boil, and add handfulls of grain slowly, starting with the slower to cook ones first. The order I have listed is the order I put them in. When the cooking water and grains are the constistancy of a thick and chunky soup, stop adding grains, and turn off heat until cereal is thick. Top with rice milk, sweetener or fruit. Then, take a short walk while it cools. But remember to lock your door, or ....
The nature of this recipe is to play it by ear, since it varies with the moisture content of the grains, wheter or not they have been toasted, and the thickness of the pan you use. Sorry it is not specific, but even the mistakes are good, and adding more grains or liquid makes the recipe adjust.