A pot and boiling water. Rinse the rice. Add the rice. Simmer and cover for 18 minutes. Fluff.
It's funny. I learned in Costa Rica since rice is everywhere there but the "cooker" is a pot. First attempt was horrible. Third attempt and everyone was pretty happy with it. Butter and fresh cilantro with black beans, some nice pork chops with salsa and fresh pineapple on the side. Fried plantains and bananas for desert. Damn, I miss it. Local store had some green salsa that was straight up awesome.