The best water ratio for cooking quinoa is 2 parts water to 1 part quinoa. For example, if you are cooking 1 cup of quinoa, you should use 2 cups of water. This ratio will ensure that the quinoa is fully cooked and absorbs all the liquid, resulting in fluffy and tender grains. However, you can adjust the amount of water according to your preferred texture. If you like a slightly softer texture, you can use a ratio of 1:1¾