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I live in a very old house with single glazing (listed windows) and until recently had three children at home who showered at every hour of the day and night, heated rooms, left kettles and lidless pans boiling on the aga for hours on end, tumble dried single t-shirts/boxers/sock and generally created an indoor fog. For the first time ever last year the larder windows did not drip with condensation throughout the cold months and it was by accident that I discovered a cardboard cannister of Saxo table salt had turned into sea water.
My supposition is that the moisture in the air (and there was a lot) was absorbed into the table salt, and I am testing this hypothesis by keeping small cardboard boxes of salt near all the windows this winter. I can't state categorically that this will solve the condensation problem you describe but our cast iron single glazed oak mullion windows are for the first time ever not dripping and mouldy, so it may be worth the cost of a container of table salt and a cardboard box to see if it works for you. (I also dry the salt out weekly and break the lumps back into grains) sad but true! It seems to be working!!
I don't think you appreciate just how much water is involved.
In a damp house you can literally remove gallons each day for months.
You would need a Siberian salt mine to make it work!
