What type of water do you use? Tap or distilled?
I've been using just tap water. It doesn't say you need to use distilled. The only thing it emphasizes is that you don't overfill it. It comes with a measuring cup. I hope my answer helps you.
Is it possible to turn the light off but keep the machine running?
Yes, they are two individual switches
does the mist come out from the side or middle top?
The mist comes out of the rim/side of the top, not the center.
How do you clean it? Does it come with a brush?
Hi,it does not come with a brush.And please wipe it with wet soft cloth.To avoid water flow into the power port.Hope this can help you.
Does this beep when it shuts off?
It does not. Does beep when you turn it on.