I've just reduced a 4l of stock in my "kitchen" to 0.5l by boiling it over an hour. I wrote "kitchen" with quotation marks, because that room might have been designated as a kitchen when the apartment was being built, but I'm pretty sure I see a lot of sagging paint on the ceiling that wasn't there before, the windows in all the rooms in the apartment look like it's just been raining inside and all the sachets I keep in the spice cabinet are wet. Is there something I could buy that would collect the steam from boiling and prevent this from happening again? The obvious answer would be to install a hood and connect it to a vent (which is conveniently located at the exact opposite point to where the stove was installed), but that would easily set me back a few $1000 and what I can afford right now is more in the range of $60. Summary Is there something I could buy within $60 range that could handle collecting steam from 3.5l of evaporated water boiled within one hour? Maybe a dehumidifier made specifically for kitchen or a special lid that allows evaporation but collects the water? If it helps, I'm located in Poland and the price range is actually around 280 PLN. 
Well, what you’re looking for is called a “still”. It boils liquid and condenses and recovers the vapor. Most commonly (in cooking) a still is used to boil off and collect pure alcohol, but stills I’ve seen are also capable of boiling off water — in fact, in places where stills are legal to own but alcohol distillation is illegal, distilling water is the excuse under which stills are commonly sold. But it really will work for you; you’ll end up with reduced stock and some distilled water. 