Cook the porridge, without stirring, until it begins to thicken and the oats are soft yet chewy. Check the oat's texture by stirring them after 25 minutes of cooking (it might need a few more minutes of cooking).
In a saucepan, bring the water and milk to a boil. Stir in the oats, carrots, raisins, cinnamon, ginger, nutmeg and salt. Bring the mixture back to boil, then decrease the heat to low and partially cover the pot.