Yes you would be fired. Upon being hired you actually sign an agreement stating you will not purchase or consume ANY competitors products or face termination. We are given cards showing the most common brands owned by competitors. This includes eating at establishments that serve only Pepsi products. Most people also do not realize this but this includes purchasing and eating other food products as well which are also owned by Pepsi.

The list also includes ANY brand bottle water not owned by Coke, orange juice (yes coke makes several brands of orange juice). Quaker, Aunt Jemima Syrups, Cracker Jacks, Doritos, Lay's, Munchies, Pasta Roni, Rice-a-roni, Santitas Chips, Sobe, Sunchips, Tostitos, Sabra, and Anything Frito-Lay and much much more.

In fact our vending machines at work are rather bland because Pepsi actually makes or owns a lot of the food companies too.

Coca-Cola is invested in only liquid beverages while Pepsi has branched out and owns countless food brands which may not be competiting directly beverage wise but are financially supportive of the competition when purchased.

Below is a small list of some stuff we cant purchase or consume:

Edit: To those thinking this answer is sarcasm it is not. This is all 100% true. I used to have a small business card size laminated paper they give at hiring listing the brands you are not allowed to consume due to competition but unfortunately it's been years and I am unable to find it.