Your car has water in it its that simple the water can get in but its very hard for it to get out and this means that when the water vaporises it has no were to go and this is why the windows fog up. Look in your trunk for water stains and also look in your spare tire well if its filled with water than your trunk is leaking probably from the tail lights or from the trunk lid seal. also the older Honda's have a tendency to have body rot by the rear wheel wells or under the car water can be getting in from their. I would also feel the carpet for moister your wind shield could be leaking or one of the door seals is leaking.