Anyone tried the vanilla or chocolate flavors? I can get 25 lbs of either flavor for 90 shipped or 10 lbs for like 45 shipped. I'll probably end up getting the 25 lbs in the next day or so, just wondering if I'm gonna have to chug it down while holding my nose or be able to drink it like ON. Also, if you get an unflavored bag/tub or whatever, is it necessary to buy a flavoring system? Could you just mix it with Gatorade or something like that instead?