Pepsi or Coke? Is this distinction very important to you?
When you go to a restaurant, do you specify that you want that specific brand, or is any old cola good enough?
If you ONLY drink Coke/Pepsi, is the onus on you to ask "Do you have Coke products?" or your food service person to tell you "We only have Pepsi" when you say "Can I have a Coke?"