I usually just go by adding a good layer of chopped dried fruit, i preferr blueberries and ginger and for some reason so does my kombucha when bottle priming. Although i have been experimenting with agave and coconut palm sugar and honey. The more complex the sugar the longer it will take, pretty much.so you could add a very small amount of sugar. I havent had any problems with overcarbing with fruit given a weeks time, i normally use 1-2 tblsp. per 16 oz bottles 1.5-3 tblsp per 22 oz bomber, then cap @80ish deg for a week.
To littlelord, i would be carefull of doing that all the time because of the oils, the way i see it is it may be ok to use teas with oils only occasionally but have always been advised against any teas with oils.