Sweat the clove of garlic in olive oil in a small pot 5 minutes before the end of cooking. Pour the water on, add the cream cheese and stir until smooth. Bring to the boil once while stirring. Season to taste with pepper.
If you want the sauce to be more liquid, just add 50 ml of extra water.
Drain the spaghetti.
Mix the sauce with the spaghetti and serve with the parmesan.