Carry water. (I use an aluminum bottle/canteen that has a neoprene outer cover)
Extra weight, healthier, cheaper, less waste in landfill.  Seriously cuts down on the soda I drink, and has the added bonus that it increases the amount of water I take in.  (Most people (myself included) do not drink enough water)  Water does not have calories/fat/sugar or other additives.  Plus I don't have to shell out $1.50 for a bottle (I would buy soda instead)  And having clean potable water on hand is great for EDC.
And I get to carry an extra clip and button compass, just because they look cool on it!
Still working on how I can add EDC items to it, the neoprene is not sturdy enough to sew stuff on it. 
