With bottled water quickly becoming a fashion don't, it's high time for a new lifestyle accessory. Like canned oxygen, which is reportedly selling well at Duane Reade stores since arriving on shelves about three weeks ago. The leading brand is Instant Oxygen, which consists of 99% pure oxygen in a can (don't ask what comprises that other 1%). Owner Kevin DelGaudio tells WCBS that he got turned on to oxygen as a healthy way to......