The cheapest way is to use rock salt inside grow space. (I remember my grandparents used rock salt between double windows on winter to prevent fogging.)
-Drill several small holes in one of the buckets along the sides and the bottom.
-Put the bucket with the holes inside the other bucket.
-Fill the bucket to the top with rock salt.
-Place the bucket in the area of your home you'd like to dehumidify.
-The bucket will begin to collect water, and that water will drip through the holes of the inside bucket.
-The water will then collect inside the outer bucket, trapping excess moisture.