Preheat oven to 350 degrees F (175°C). Grease a 9x13-inch baking dish.
In a large bowl, combine the rice, sugar, half and half, water, evaporated milk, butter, and salt, and mix together until blended.
In a separate bowl, whisk together the eggs and 2 cups of water. Pour the egg mixture into the rice mixture, and stir until combined.
Pour the mixture into the prepared baking dish. Place in preheated oven, and bake for 45 minutes to 1 hour, or until golden brown and creamy.
Once out of the oven, let cool for 30 minutes before sprinkling with cinnamon and adding the raisins if desired.