Broccoli Rice Casserole

INGREDIENTS

• 2 (10 ounce) packages frozen chopped broccoli
• 3 cups instant rice
• 1 (10.75 ounce) can condensed cream of mushroom soup
• 1 (10.75 ounce) can condensed cream of chicken soup
• 1 1/4 cups water
• 1 (16 ounce) package processed American cheese, cubed
• 1 tablespoon butter
• 1 bunch celery, chopped
• 1 large onion, chopped
• salt and pepper to taste