First of all, you want to stay away from products like Artificial Tears and other over-the-counter eye lubricants, because these products contain a form of soap as a stabilizer, and while they are fine for occasional use in normal eyes that just happen to be in a temporarily drying condition,
for the lifelong treatment that will be needed
for dry eye, the soap stabilizer will be too irritating. There are special preparations that contain cyclosporine that are used to treat KCS.