Taco Soup

I am hoping to make this soon. It has very little ingredients and looks tasty and easy!! (perfect for me)

1 lb. ground beef
1/2 c. chopped onion
1 c. water
1 can diced tomatoes
1 can kidney beans
1 8 oz. can tomato sauce
1/2 pkg. taco seasoning mix

In a heavy saucepan cook ground beef with onion. Drain off fat. Then add water, tomatoes, un-drained kidney beans, tomato sauce and seasoning. Simmer together for 20 minutes!