Fidlock Twist 550ml Bottle + Bike Base

TWIST Bottle 550 Compact including TWIST Bicycle Base: 

The TWIST Bottle has revolutionized the bike bottle. Without a conventional bottle cage, this magnetic-mechanical bottle holder system offers a whole new level of freedom in terms of handling and possible applications. With a simple twist, the TWIST bottle can be detached from the bike and reattached just as easily by bringing the magnets together and engaging the mechanical locking mechanism. The TWIST Bike Base, which is also equipped with magnets, is attached to the threads on the bicycle frame with two special screws.