If you slide,
DONT brake
DONT stamp your foot on the clutch.
DONT touch the clutch!!
DO steer in the direction of the slide, little by little to encourage the car to regain traction forwardsm it doesnt take that much to get it back on straight. Dont over-do turning into a slide, or you'll just end up spinning the other way, which is even more dangerous.
DO ease off the accelerator, but dont come off it completely.
DO keep the engine turning with the accelerator so when/IF grip returns you move do actually go forwards.
REMEMBER your tyres are not good in the snow and ice (unless you have winter tyres) and that it takes very little to slide, eg turning slowly on a reverse camber can start a slide very easily even if you think you are being cautious.
HIGHER gears are better than low gears.
LOW revs are better.
If you cant move off without spinning, use 2nd gear.
LEAVE lots of space between you and other cars, particularly if you suspect someone is being a bit to cavalier in their attitude to the snow and ice.
Its worth having a go at sliding on an empty safe corner or empty car park or something, if you get the chance. Just to see what its like when your car slides, eg once a heavy car starts to slide there may be a point of no return!!! and practice turning gently LITTLE BY LITTLE into the slide to feel the car try to right itself back to a straight drive.
OR DONT DRIVE, get the bus. or build igloos!