Going back to talking about eating cheap...
Soda is incredibly expensive AND hard on your body. (Trust me, I would know...) You need the caffeine rush, you're dying for it.
Did you know apples have just as much caffeine as a regular soda? No? Well, it's true. =P If you're trying to cut out caffeine, you need to cut down on apple consumption. If you want to cut out soda, but have a caffeine addiction? Add an apple or two! They're cheaper than soda and full of delicious natural sugars.
Spearmint and peppermint can be used as a appetite suppressant. So drinking peppermint tea when trying to make it through a meal would be easier. Or even spearmint gum!