Substitutes for alcohol using holiday mixers?

Where I work we have a lot of holiday cocktail infusion bottles. I enjoyed these before for a fun holiday drink but due to allergy treatment I have quit drinking. I was wondering if these mixers can be enjoyed without alcohol and if anyone knows of beverage that can be used instead of rum, vodka or whisky. They are the type you fill the bottle of infusions with the hard stuff then leave for 24 hours in the fridge.