Press the Saute button on your Instant Pot. Place water, coconut milk, cornmeal and sugar in the Instant Pot and stir using a whisk so there are no lumps.
Bring mixture to a simmer and whisk again. Put the lid on the Instant Pot and set the pressure release valve to Sealing. Cancel the Saute function, Press the Manual or Pressure Cook button then select the + button to set the timer for 9 minutes.
At the end of the cycle, press the off Mode and let the pot natural release for 10 minutes. Turn the valve to Venting to manual or quick release the remaining steam.
Once the pin in the lid drops, open the lid, stir the porridge. Add traditional spices, vanilla, cinnamon, nutmeg and salt or vanilla, cardamon, and coriander and serve.