Put rice and water into rice cooker (put rice in first, then add water until the 3 mark on the cooker is reached). Push button to start cooking. When done, button will pop up and light change to "warm.".
Let the rice sit in the cooker without opening the lid for about 15 minutes to complete steaming.
Put rice into non-reactive bowl (glass, stainless steel, wood, etc -- ), pour sushi vinegar over rice and toss gently with rice paddle to mix vinegar into rice. Note: please be gentle so you do not mash the grains of rice. Also, each grain should have been coated with the vinegar and achieve a shinny sheen, add more as needed).
Fan the rice to cool as you are mixing in the vinegar.