I usually put 2 60 lb bags of sand in the trunk. That helped immensely to get traction on the ice with my Blizzaks. I've been meaning to go to Home Depot to get some, but it hasn't even snowed here yet.
2011 GT, Kona Blue Brembo 3.73
Mods: Airaid CAI, Eibach Pro Kit Springs, Koni STR.T shocks and dampers, BBK Longtubes and X-pipe, Lethal OAPs, GT500 Axle Back, Forgestar F14s 19x9/20x11, Fays2 Watts Link, Barton SS and Bracket