I will get flamed on for this, but I'd be unsure of whether or not to get plain old Creatine Mono, or to get Cell-Tech Hardcore Pro Series Orange flavour. The former is more versatile, and I won't get bored with it. I assume, being apocalypse, I don't have to pay, so the latter is attractive (when we take price out of the equation).
I think Gorilla's Blood would be a close runner up