I've researched and tried most nootropics and a lot of it is borderline wether or not it does anything. There is also a knowledge void on the possible harmful effects of the products, although I doubt any are too harmful if harmful at all.
"Hacking your brain" is also a vague request. If your goal is to optimize things like energy, mood, ect. A good rule of thumb is in general your nutrition should be based on the foods our ancestors would have had access too. If you limit your diet to these items you will probably notice a very big difference it will also keep you lean.
I've tried dozens of nootropics and there is no magic pill and I don't take any supplements anymore. Understand that supplement companies want to make money. They exploit placebo.
Something that will give you energy and put you in a good mood (helpful for mundane tasks) without causing any rebound is Kratom. Because it's not a stimulant you'll feel the effects and then just slowly go back down to baseline where as with stimulants you spike and then go below baseline and then go back up to baseline. Kratom is the real deal you might be interested in it.
It tastes awful in powder form though. In general, I don't think its worthwhile unless you'll be using it for a specific reason, like memorizing for an exam or something.
And I definitely enjoy drinking them, especially the ones with Stevia. :)
How does VitaminWater fit into your diet as a health nut?