Cool broccoli and rice according to package directions. Preheat oven to 350°F

In a medium saucepan over low heat, mix cream of mushroom soup, cream of chicken soup, and 1 1/4 cup water. Gradually stir in cheese until melted

Melt butter in large skillet over medium-high heat, and cook and stir in celery and onion until soft

In large mixing bowl, combine combine broccoli, rice, soup and cheese mixture, celery and onion. Season with salt and pepper. Pour mixture into a 9x13 inch baking dish

Bake in preheated oven for 45 min, until bubbly and lightly brown.