Notice that the plastic bottle in commercial is colored to make the tea look ultra-green. Another thing that the commercial doesn't tell you is that a lot of the polyphenols in green tea start to break down within a few hours of brewing, so that by the time that bottle of tea reaches you, it's lost of lot of its health-promoting "punch".
So don't succumb to the temptation of bottled tea—it's healthier to brew your own. The whole tea-brewing process is also an excellent opportunity to take a step back and relax. Green tea isn't just a drink; it's an experience.