Wash rice and rinse well. Add 3 cups water and cook in rice cooker. To cook on stove, bring rice to a boil in a covered saucepan. Simmer for 15 minutes. Remove pan from stove and let sit for another 10-15 minutes. Mix together vinegar, sugar, and salt, and cook over medium heat until sugar dissolves. Cool. Place cooked rice in a large mixing bowl. Sprinkle half of vinegar sauce over the hot rice; mix gently. Taste. Add more vinegar sauce if desired. Makes 9 cups. All types of sushi can be made from this rice.