Partially cook wild rice according to package directions (but for 30 minutes) drain off liquid and rinse. Set the partially cooked rice aside. In a large Dutch oven or stockpot, combine the chicken and water and bring to boil. Reduce heat, cover and simmer for 35 to 40 minutes or until chicken is tender. Remove chicken from broth and let stand until cool enough to handle. Strain and reserve broth. Remove chicken from the bone. Cut into bite-size pieces. Add onion and celery. Cove and cook for 5 to 10 minutes or until translucent, add the mushrooms and cooked for 4 to 5 minutes longer. Remove from the heat and return broth to the stock pot. Add partially cooked wild rice to the chicken broth. Stir in the bouilon granules, white pepper and salt. Bring to a boil and then reduce heat and simmer, uncovered for 15 minutes. In a large sauce pan, melt the butter, stir in the flour until smooth. Add milk all at once. Cook and stir until bubbly. Stir this into the soup mixture. Stir in the chicken pieces and the dry white wine, heat though.