Drive slow, under 45, lower if it's really bad. leave a lot of space between yourself and the person in front of you.
And if you start sliding, do not over correct when spinning the wheel. Do not turn away from the slide, do not use your brakes.
Turn slightly into the slide (turn slightly the same direction that your back end is sliding into) and DO NOT over correct, stay calm, it's a small adjustment.
Expanding on sliding:
If you have front-wheel-drive this changes somewhat. If you have
very good skill at keeping your wheels pointed exactly where you want them,
and the road directly in front of you is clear for a goodly distance, you try to keep your wheels pointed exactly in the direction you want to be going, and gun the engine.
Do not try this if you are not confident of your ability to correct quickly.
If it works correctly, you'll 'drag' your car back into the correct alignment; this is something I've succeeded at before multiple times, but I've been an ice/snow driver for a
long time, and had practice at low speed (20-30MPH) slides and regaining control before I managed to pull it off at 45 MPH.
Do not try this if you aren't confident in your reflexes.
And do not try it with all-wheel/4-wheel drive. It only works if you're FWD only, otherwise the 'push' from your rear tires will drive you more out of control.