The exact amount of water you should add to your rice cooker depends on a variety of factors, including the brand of cooker, the type of rice and your elevation. But a few easy tricks can help you guess approximately how much water is needed. After a little practice with your rice cooker, you won't have to waste time trying to remember exactly how much water to to is needed cook three cups of rice.
A good rule of thumb is one cup of water for every cup of rice -- or approximately three cups of water to cook three cups of rice. Use this as a starting point, adjusting the water level as necessary as you become more familiar with your cooker and how it handles various kinds of rice.
High elevation causes water to boil at a lower temperature, which means you'll have to add more water than normal to cook your rice. Start by adding the appropriate amount of water using either the cup or finger method. Then, add a bit more to counteract the lower boiling point. For three cups of rice, add right around 1/4 cup of extra water.
If you're cooking a very dry variety of rice, you'll need to add more water to ensure enough moisture to adequately soften it. Add approximately 1/4 cup of extra water when cooking drier varieties of rice.
3:1 Use 3 parts water for 1 part rice...the same rule applies if you are boiling it or making a rissotto (which you should be doing with arborio!!) but there are so many uses for this delicious rice, you'd get away with substituting it in many recipe.If you can do according to the instructions,it will be no hard for you to cook a good meal.