Drain the mushrooms. Reserving the liquid and set aside.
In large skillet, melt butter over medium-high heat in large skillet. Add the celery and onions and cook for 4 minutes or until onions have softened.
Remove the pan from the heat and stir in 1/2 cup of the dressing, water, and the reserved mushroom liquid.
Fold in the stuffing mix and cranberries and mix until thoroughly moistened.
In a separate bowl, combine turkey, mushrooms and remaining 3/4 cup dressing.Spread the turkey mixture evenly in a buttered 8-inch baking dish. Top with the stuffing mixture.
Bake uncovered for 40 minutes or until the top is nicely brown and is bubbly. Serve immediately.