Last year I got 2 bags of Calcium Chloride for the driveway because there was no salt available. I keep it in a bucket by the door. Put it away in a cabinet in summer. Got it out and it's solidified. Used a masonry chisel to break some of it up but may never get it all out of the bucket. I'll try water, a slurry should work ok. The unopened second bag is still loose so it should be ok.