These drinks are calorie free, which technically should help people lose weight and prevent sugar-related diseases like metabolic syndrome and diabetes. However, the evidence for these beverages having any use is completely nonexistent.
The classic approach to performing supersets is to work two opposing muscle groups back to back without any rest between sets. This technique is usually applied to antagonistic muscle groups such as biceps and triceps, chest and back, quads and hamstrings. An example of a superset would be one set of biceps curls immediately followed by a set of triceps pushdowns.
The best type of workout split is a 2 or 3 day training split. Again, progressive overload is behind the increase in the number of sets per bodypart for advanced trainers. As muscles adapt, increase the amount of stress they receive. One way to do this is to increase the number of sets performed. Of course, the increase only enhances strength to a degree.