It will depend on if you want it to be exactly 50/50 as your target or if you are ok with being close
to get 18mg 50/50
juice from 36mg 50/50 at 20% flavoring (flavoring is generally pg based) you would use the following to make a 10ml batch
5ml 50/50 nic
.5ml PG
2.5m of VG
2ml of Flavorings
So, if you picked the 36mg 50/50 nic and get the VG as your dilution base without purchasing additional PG you can make a 45/50 blend.
If you wanted to get exactly 50/50 you would need to purchase PG in addition to your kit.
Hope that helps

If not please send me a message with your phone number and I can give you a call and help
