Dears Bars, Pubs and Food Establishments of the Northeastern Seaboard:
When a patron asks for a Coca Cola Classic, that patron actually wants a Coca Cola Classic. If you only have Pepsi, do not assume that the patron is indifferent. The patron is tired of accidentally having a sip of that nasty stuff when really wanting a Coca Cola Classic. Simply inform that patron that you have Pepsi products, and then the patron can order a water with lemon.
There is a difference, and yes, I can tell!