Cook bacon and onion in 4 quart pan over medium heat until bacon is crisp. Remove bacon and onion; drain on paper towels. Pour off fat. Place potatoes, celery, carrots, water and 1 1/2 tsp salt in pan. Cover and cook on high heat until mixture comes to a boil, about 5 minutes. Reduce heat to low and simmer 15 minutes or until vegetables are tender. Drain.