In a pinch, you can use a nightlight or some other kind of light which doesn't draw a lot of power. Touch one prong to the grounded case of something plugged into a good outlet, then touch the other to ground on the bad outlet. Do the same for neutral. Neutral is always the larger blade on all outlets - they make it so you can plug a hot blade into a neutral blade socket, but you can't plug a neutral blade into a hot blade socket. Makes sense if you think about it.