Large pot, combine broth, water, chicken, carrots, and celery. Bring to boiling, stir in rice (reserve seasoning). Cover and remove from heat In small bowl, mix flour, salt, and pepper. In medium saucepan over medium heat, melt butter, stir in seasoning packet until mixture is bubbly. Reduce heat to low, then stir in flour mixture by tablespoons to form a roux. Whisk in cream, a little at a time, until fully incorportated and smooth. Cook until thickened, 5 minutes. Stir in cream mixture into broth and rice. Cook over medium heat until heated through, 10-15 min.