I eyeball the rice I pour into my pot, I eyeball the water I pour in next (without washing!), I crank up the stove until the water starts to boil, and then I turn it down, cover, and set a timer for 20 minutes. When that's up I turn off the stove and look at the clock so I know when five or ten more minutes have elapsed so I can uncover and give the whole mess a stir to prevent sticking to the pot. If I'm cooking rice, I'm also cooking something else, so it isn't a hardship to be in the kitchen to notice the timer.
This technique never fails to produce tasty rice. If one has a stove, why does one need a rice cooker? I've also cooked tasty rice over a coleman propane single-burner before, so you don't actually need a stove either.