My plants shrivel up if I don't water them. And then, as you mentioned, the leaves expirate the moisture.
A former co-worker used to put tall cans spaced around in his shop. On the top was, I believe a funnel-shaped lid that had, if I'm right, calcium that would absorb the moisture. The moisture would collect and funnel down into the can, which could, in turn, be dumped later.
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TomS
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