A 6-pack of 2 oz bottles of cold brew concentrate.  Don't let the size fool you, these little puppies pack a punch.
 
Shoot It or Dilute It.
 
To Shoot It--unscrew cap, pour into mouth and I'm kidding, you know how to drink stuff.
 
To Dilute It--add concentrate to 6-8oz of water or milk. Try it hot, try it cold. Toss one in your bag and down it right before your big anything.

Enjoy and tell your friends.