Preheat the oven to 425° degrees F. Line a rimmed baking sheet with foil and set a wire rack on top; coat with cooking spray. Combine 1 cup water, the coconut water, rice and lime zest in a medium saucepan and bring to a boil. Reduce the heat to medium low; cover and simmer 8 minutes. Remove from the heat; add the carrots, red onion, 1/4 teaspoon salt and a few grinds of pepper (do not stir). Cover and let sit 10 minutes, then fluff with a fork to combine. Discard the lime zest.