I get the ExquisiCat beads at Pets Mart, fill up a nylon stocking with them, and place them in an air tight Tupperware box with a bowl of water and a digital hygrometer for a week or two (wait till the hygrometer gets to ~70%).
I made my first batch about 2 months ago and use ~2lbs per 150 quart Igloo Cooler. I check every day or two and the humidity remains at ~68%. I haven’t had to refresh them yet, but all you have to do is add a water source for a couple of days when they start slacking.
Imagination will often carry us to worlds that never were. But without it we go nowhere. -- Carl Sagan
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