My husband says his mom would make this for them on a cold morning (it does get cold in Mexico sometimes). They were rural so a lot of stuff was make do with what you have.
About 2 cups rice
1 1/2 cups water
Cook the rice just like you would normally make rice. Add about a cup of milk about half way through, though you can add more depending on how you like it. My husband adds about 1/3 cup of sugar (he does not measure it, just puts it in) and 2 cinnamon sticks.
I am sure you could adjust it to how you want the rice, thick or milky, and how sweet you like it. I like it with lots of cinnamon and somewhat like cereal with milk. He likes it thick and really sweet.