Using CO2 to dispense cocktails with not carbonate your cocktails. If your cocktails already have carbonation, using CO2 will help preserve the carbonation while serving. The nature of using the QuikBOX is for events/parties/functions that will serve many cocktails over the time of said function, meaning that use of CO2 gas to dispense is fine. Force carbonation of cocktails is a different subject matter altogether, which we can help with as well! If you are wanting to dispense with Nitrogen with your QuikBOX, simple switch out the CO2 regulator that comes with the QuikBOX Kit with a Nitrogen primary regulator. If you need additional information or help, give us a call at 855-784-5827