Powerade/Gatorade is just coloured water, sugar and salt, and only serves hydration, which isn't performance enhancing just common sense. Caffeine on the other hand is one of those drugs that sits in a grey area, so some athletic organisations consider it a PED while others don't.
While defining what makes a PED isn't clear cut, I think the general rule of thumb is a substance that has a direct and quantitative influence on your abilities. Which is probably why supplementing testosterone makes the cut, but protein powders don't.
While defining what makes a PED isn't clear cut, I think the general rule of thumb is a substance that has a direct and quantitative influence on your abilities. Which is probably why supplementing testosterone makes the cut, but protein powders don't.