I’m not really sure what’s the difference other then the ingredients and taste. But if you can make kombucha you can certainly make jun.
4 green tea bags, 1 cup raw honey, I cup jun starter 1 gallon filtered water
I also recommend you use good quality honey for jun. I use this one Limited-time deal: ONEROOT Canadian Boreal Forest Raw Wildflower Honey (1kg) https://www.amazon.ca/dp/B01N5Q3DOW/ref=cm_sw_r_cp_api_glt_i_59MQ6ADZG0NMXN1FYNGF