One tries to help, it's no different to filling a soda bottle and putting it in front of a fan to keep you cool in the summer, and no different to the "hack" posted *ahem* pages back about half filling a bottle with water and freezing it so you top that up and have chilled water whenever you wish.
Sometimes cheap and simple is the best, and being a Scot that means I'm tighter than a camel's arse in a sandstorm so I like "cheap"