I had been making rice milk the "right way" for a while and then started to get lazy. The following is not quite as good but still good enough for cereal. It tastes better when it's had a chance to cool in the fridge. Now when I'm short on time, this is what I do:
Place 1 C raw rice in high speed blender.
Add 2-3 cups cold filtered water.
Blend for a couple minutes.
Strain and squeeze through nut mylk bag (I made my own)
Sweeten with maple syrup and add a pinch of salt
This makes a half batch, which is a quarter gallon (fill up a half gallon jar half full; or use a pint or something slightly larger than a pint).