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.