Preheat the oven to 450°F. Lightly spray a large non-stick baking sheet with oil.

Combine the water, flour, and garlic powder in a bowl and stir until well combined.

Coat the cauliflower pieces with the flour mixture and place on the baking sheet; bake for 20 minutes.

While the cauliflower is baking, combine the hot sauce and melted butter in a small bowl.

Pour the hot sauce mixture over the baked cauliflower and continue baking for an additional 5 minutes.

Serve with blue cheese dressing if desired and celery sticks.