Add rice, coconut milk + water (see directions below) and salt to pot or rice cooker. Before cooking, stir to mix in any coconut cream (the thick, white part of the coconut milk). After the rice is cooked, stir in the lime zest and serve.
For stovetop: To get the liquid amount right, simply add the coconut milk to a large (4 cup+) measuring cup, then add water until you reach 4 cups of total liquid. Place in a pot, bring to a boil, reduce heat and simmer, covered, usually about 35-40 minutes (check package for instructions specific to the rice you're using), or until the liquid is absorbed.
For rice cooker: To get the liquid amount right, simply add the rice and the coconut milk to the rice cooker first, then add water until you reach the desired amount of total liquid.
If you want to avoid saturated fat, you can replace the light coconut milk with plant milk + a few drops of coconut extract.