B.Y.O.D

Bring your own drink.  Simple as that.  You could be saving big bucks if you added them up by preparing your own coffee in the morning to bring along with you, or preparing at work; by having bottles of water available at work for days you run out or forget; and by preparing yourself your drink of choice during the day.  By bringing your gatorade, soda, crystal light, or chocolate milk (etc.) and NOT allowing trips to the vending machine, trips inside a liquor store, or a fast-food place for your favorite thirst-quencher, you can really save money.  Being able to purchase these drinks on sale at a store that doesn't regularly mark up 10x for convenience, you can control the budget of your drinks as well as control what you consume regularly.  i.e.- don't allow sodas as a regular all-day drink.  If this is an area you usually loose the battle on, then challenge yourself to improve, and soon it will become a habit.  Not only will it help your wallet, but it can help you make healthier choices too.  If you're actively trying to loose weight, be sure you aren't drinking your calories!