Preheat oven to 350 degrees Fahrenheit.

Grease muffin pan or line with paper liners.

In a medium bowl, combine flour, pumpkin pie spice, baking soda, and salt.

In a large bowl, blend pumpkin, eggs, sugar, water, and vegetable oil until just combined.

Add the dry mixture to the wet ingredients and mix until combined.

Spoon batter into prepared muffin tin, filling about 1/2 inch below the top.

Prepare topping by mixing brown sugar, sugar, pumpkin pie spice, and softened butter until crumbly.

Sprinkle topping evenly over each muffin.

Bake for 22-28 minutes, or until a toothpick inserted in the center comes out clean.

Allow muffins to cool slightly before removing from pan. Serve warm or at room temperature.