Don't use liner on the waterline, it might be too much and since you want a blank stripe between it, skip it.
Just make a line with a black kohl pencil, smudge it and put some black eyeshadow on top. Then smudge it again a little until you're satisfied. For the finish use some liquid black eyeliner to get an exact line. Cotton buds are allowed ;-)
Unfortunately no one will see my eye make-up: it's spring outside and with blue sky and bright sun I need my sunnies, yeaaaah! :-)