Add water, half and half and salt to a pot and bring to a boil.
As soon as it starts to boil, slowly add the grits while constantly whisking.
Turn the heat down to low, cover and cook for 5-7 minutes. Stir several times, to prevent the grits from sticking to the bottom of the pot, until it has thickened but has some moisture left.
Turn off the heat. Stir in the cheddar, Parmesan, butter and pepper until everything is melted and smooth.
Adjust the salt if needed.
It will continue to thicken as it cools. Serve warm.
Notes
-It is delicious to take a scoop of the leftovers, flatten into a patty, place in a frying pan and cook for a few minutes on each side to crisp and serve with an egg.