Snow tires and sandbags in the trunk for weight/added traction and in case you should you be stuck (sprinkle sand in front and/or rear of tire) will certainly help. Exactly where you drive will also have a significant impact on how well you will be able to get around in a RWD car. Are there steep hills, are the roads regularly cleared, etc? Most important is how skilled you are at driving in snow/ice conditions. If you know how and when to modulate the throttle and how to steer properly you'll be fine. If not, you'll be stuck or wrecked!
Remember, there was a time that almost every car on the road was RWD and most of us got around just fine (it snowed then too). That doesn't mean that FWD/AWD/4WD aren't nice to have.
"Some men worship rank, some worship heroes, some worship power, some worship God, and over these ideals they dispute and cannot unite, but they all worship money. - Mark Twain