Coat the inside of your slow cooker with non-stick spray. Pour in the rice and salt.
Bring the water, coconut milk, and sugar to a boil in a saucepan. Whisk to combine. Pour the coconut mixture over the rice.
Cover and cook on high for 2 hours.
Remove the lid and stir in the vanilla and garam masala.
Ladle the rice pudding into bowls and top with chopped pistachios, rum soaked raisins, toasted shredded coconut or really, whatever you want to toss in there.