I've got things narrowed down to a science after experimenting for the past year. I PIF'ed things I didn't like and made it so I would have larger bottles of the things I can vape on for days at a time.
1 - 100 ml AVE gorilla juice (with 50 ml left!!)
1 - 120ml caramelized banana (my diy)
1 - 30 ml, melon boba (soon to be a 60ml)
1 - 30 ml unflavored 36mg (backup , backup, backup, will soon be a 120ml)
my girlfriend on the other hand, has at least 20 10ml's and 8 30ml's rolling around in 7 different spots in the house and her purse. I also give her all my "shift vapes" from work.