[allenphoon]

Just wanna give it a try on the question, but most porably it won't help much, since it already pass that long..hehe
As i know, in order for the water droplet to form around the cold media(ice bottle) there need water vapour or any state of water that exist in our atmosphere, as water vapour absorb the cold, the hydrogen bonds form between water molecules and hence stick to the cold water bottle, so far anyone who read this should be understand..hehe, a bit scientific word.
Then, water droplet form at the bottle, but during this process, the humidity will be lower, it is because the percentage of the water vapour in the atmosphere is directly inversely to the amount of water vapour, as water is form, which means the water vapour in the atmosphere had changed it's form from water vapour to water droplet, and this will cause drop in the humidity.....the humidity remains till so low because the transpiration of plants and water still evaporate but it had reach a stable condition at that level, thats why it state the humidity level on twenty something, this process continue until the temperature of the ice reach a point when less water vapour is converted to water droplet and then the humidity increases the "converting" process begin to slow down and return back to normal level as the converting process not that vigorous....
(pls-this is just theory, possible to wrong in any description, do correct me...)
Anyone agree with this?