For all of the grossness associated with sweating, it's a vital function for dealing with hot climates. As perspiration evaporates or is hit by a breeze, the skin is cooled. Designer Benjamin Helle took that simple concept and applied it to a new kind of water bottle, made for cyclists.
It's a design that's so simple, it's just begging to be made into a DIY project. Since ideas that appear on Yanko Design and Behance don't often make the jump from concept to on the market, you might as well try wrapping your water bottle in some cloth, and see if you can make Helle's clever solution work yourself. And let me know if you do!