Cook the quinoa: measure out one cup of quinoa, pour into a colander, and rinse the quinoa under water for a minute. Pour the rinsed quinoa into a pot and add two cups water (you're going for a 1:2 ratio of quinoa and water). Bring to a boil, then cover and simmer for 15 to 18 minutes. Remove from heat, let sit for a few minutes, and fluff with a fork.