/diy/ - Do It Yourself

My wife uses a secondary card linked to my bank account, and she can therefore see everything I buy if I don't buy it cash, and gets suspicious every time I draw out some money.
She hates me drinking RedBull but I'm addicted to the stuff. It's not even a money problem I'm pretty rich but she thinks it'll make me impotent or something idk.
I already have a fizzy drink machine, the stuff with a carbon dioxyde that makes sodas out of still drinks. I think if I can figure out the recipe for RedBull I can make my own without my wife knowing.
Anyone here ever tried something similar?
Thoughts and ideas?