Instead of kitty litter, I have switched to playground sand which is a better traction product as it is much coarser, packaged dust free and does not clump like wet kitty litter does. I usually purchase the sand in the early spring when Home Depot et al has it on sale in time for outdoor home projects.

Also depending on where you live and snow fall levels, a quality set of tire chains is a good investment. The cost varies from $60.00 for smaller passenger car tires then upwards of $150.00 which I just paid for 20" truck tire chains...
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Earth and sky, woods and fields, lakes and rivers, the mountain and the sea, are excellent schoolmasters, and teach some of us more than we can ever learn from books.

John Lubbock