Homemade Horchata: Combine 1 cup uncooked rice and 2 1/2 cups steaming hot water in a large bowl. Soak at room temperature for 2-4 hours, the rice will not be completely soft, this is OK. Alternately, you can use room temp water and soak for 8 hours or overnight. Pour the rice and water into a blender. Blend until creamy, 2 to 3 minutes. Add 1/3 cup honey or maple syrup, 2 teaspoons vanilla, 1 teaspoon nutmeg, 1 1/2 teaspoons cinnamon, and a pinch of salt. Blend until combined. Pour the mixture into a large pitcher or jar. Add 4 cups milk and stir to combine. Chill until ready to serve. Stir well before serving.