More from the article ...

... To stay in the zone, gamers often turn to caffeine-packed beverages like coffee or energy drinks, which present potential health risks when consumed in large quantities. A team led by researchers from the University of Tsukuba in Japan wanted to see if sparkling water could provide a healthier alternative.

On two separate occasions, 14 casual gamers were asked to play virtual soccer for three hours. In one of the sessions, they drank plain water, and in the other, they drank sparkling water.

Based on measurements of reaction times, pupil size (indicating fatigue), physical stress, and self-reported tiredness, it was sparkling water that proved best for maintaining attention levels and minimizing fatigue. ...

So, maybe ...

Caffeinated beverages based upon sparkling water® ?