Yes, you can mix pepsi and coke, theres no rules or laws saying you cant… The only thing you cant do is have your front of your machine saying “coke” as coke are greedy fucks and if they see you with a machine that has there name on the front they can take your machine away from you… I want to be independent NOT giving coke a percent of my profits so my machine fronts are almost all pepsi as pepsi does not care if you advertise there product.