Place the rice and water in a saucepan, and bring to a boil. Reduce heat, cover, and cook 20 minutes. In a skillet over medium heat, cook the beef until evenly browned.
Remove and discard the seeds, and membranes of the bell peppers. Arrange peppers in a baking dish with the hollowed sides facing upward. (Slice the bottoms of the peppers if necessary so that they will stand upright.)
In a bowl, mix the browned beef, cooked rice, 1 can tomato sauce, garlic powder, onion powder, salt, and pepper. Spoon an equal amount of the mixture into each hollowed pepper. Mix the remaining tomato sauce in a bowl, and pour over the stuffed peppers.
Put in a pot with a little water on the bottom to prevent sticking and burning, and heat for about 30 min or until peppers are fork tender