As a DM, you are not only responsible for entertaining and wrangling your players, but also for refreshments. At my house, this mean going to the Acme and buying at least a 2 liter of cola and a bag of pretzels. Since funds were often tight, I went with the white label Econo Buy pretzels and for drinks I went with the surprisingly tasty, C&C Cola. I could often get a six-pack for under a dollar, which meant that with the pretzels, I could feed 3 players and a DM for just under 2 bucks.
How did C&C Cola keep prices so low? Well just watch this commercial that explains their supply system and find out.