All of these are legitimate drinks! They pretty much contain the same ingredients to help you get through the day on the run from the undead. (Although, I would just stock up on Mountain Dew myself)(Mmm...Mountain Dew...)
Of course, if you're on the grab-n-go during the days of the dead, ya can't be too picky.
But, if you are packing your bags now in anticipation, I would suggest you shop around. For example, the "Zombie Survival Can." The first place I saw it, the list price was $9.99. (Ouch!) However, a little search on the wonderful, World, Wide Web, I found the same drink going for...are you ready? A whopping $1.98!!
Clearly, some places will be gouging us as we plan for the end.
Gotta love the system!