The ratio of water to rice is 2 cups of water to 1 cup of rice.
So when you're making rice and are making 1 cup of rice you would add 2 cups of water to the rice.
If you're making 2 cups of rice then you would add 4 cups of water to the 2 cups of rice.
When cooking 4 cups of rice you would add 8 cups of water to the rice.
Or when you add rice to a pot add about half of the rice and then cover the rice with at least 3 inches of water.
That is what I do when cooking rice in a pot on the stove I will add half rice to the pot and then cover the rice with 3 inches of water.
Then I bring the water to a boil and then once it's boiling I will stir the rice occasionally and then turn the water down to simmer.
It takes around 12 minutes to cook a small pot of rice on the stove.