water bottles.
shovel – some stores sell smaller shovels that fit well in a trunk.
flashlight – pack a waterproof flashlight with extra batteries in case you find yourself stuck in a remote, dark location.
ice scraper – hopefully you already keep this in your car, but just in case, this is a must have in a snowstorm.
first aid kit – another item that is smart to have all year long.
a bag of salt or sand – a bag of sand or salt is smart to keep in your car during the winter because it can provide traction if you need to get unstuck and it gives your car more weight in icy 