In a saucepan over medium heat, combine the cream of potato soup, water, pumpkin, butter, and cream. Season with salt, pepper, garlic powder, and ginger. Stir until blended, and bring to a simmer. Reduce heat to low, and simmer for 15 minutes.
Remove from heat, and pour into a tureen.
Sprinkle the top with paprika, and top with seasoned croutons.