every time i am asked for soft-drink at restaurant...my answer is always:
"Coke"
"sorry, coke tau nahi hay...Pepsi hay"
"chalo Pepsi hi lay aao" 
...................
..
and for those who dont know whats the difference between Coke and Pepsi....Both are much the same but a chilled Coke has that extra bite, extra sting, extra fiz, which Pepsi lacks.