For drier rice, use 1/4 cup less water. For moister rice, use 1/4 cup more water.
1 Cup rice, 2 cups water makes 3 cups - 4 Servings (3/4 cup cooked)
2 Cups rice, 4 cups water makes 6 cups - 8 Servings (3/4 cup cooked)
3 Cups rice, 6 cups water makes 9 cups - 12 Servings (3/4 cup cooked)