Preheat your oven to 350°F (175°C).
Grease your 9x5 inch loaf pan thoroughly.
Mix flour, baking soda, salt, and spices together.
Combine pumpkin, oil, eggs, sugar, water, vanilla separately.
Gradually add dry ingredients to wet mixture.
Mix cinnamon and sugar for the swirl.
Pour half the batter into prepared pan.
Sprinkle half the cinnamon mixture over batter.
Add remaining batter, then remaining cinnamon mixture.
Use knife to create swirl patterns gently.
Bake for 60-65 minutes until toothpick comes clean.
Cool in pan for 10 minutes completely.
Remove from pan and cool on rack.