If you live in an area where it snows regularly in the winter months, you know the key is preparation. Most families have a shovel or two, and these days, many have a snow blower. Plus, it’s also essential to keep some ice melt handy. There are several varieties of sidewalk salt, but even though we often deal with icy sidewalks here in Middle Tennessee, it’s usually hard to find. We make sure to pick up a bag when we visit family in Indiana. But there’s one big problem. Since we don’t get severe weather very often, the salt can last for long periods. And while that sounds like a good thing, it’s not…