Im a pro at ecigs, if there is such a thing. Generally two to three drops of eliq is considered 1 cig(15 drags or so). (Drippers pov) with your idea, dripping would be prime. Figure out what voltage you need to heat your stuff up correctly, most likely your going to have to go to model that allows you to adjust the vape voltage alittle pricey. I cant tell you which because I only vape eliq on my joye mega ego. But inside the atty those three drops of eliq there can be anywhere from 18mg of nic(avg cig) to 36mg of nic(two at once) depending on how your liqs are made. I prefer 36mg, but, this shows that since the mg of nic can be mesured down to the mg per apx cig. you will accurtaly be able to mesure your substance down. to that level as well. Just find out what voltage you need to heat up and activate while evaporating your substance without burning it.
There are alot of diy kits for eliqs out there. Go look one up. If your not looking for flavor on your ecig just go with a 20%vg80%pg blend. Nice on the throat, doesnt make you thirsty etc. otherwise buy some menthol crystals and disolve tiny pieces little by little into your eliq bottle. too much menthol is no fun. but you can always add more. Same with your substance. gl!
Btw you cant just put a liquade inside an ecig, it just wont burn. you need to mix the pure substance with a vg/pg mix i believe. I know no water though, any water needed is inside the vg/pg mix unless otherwise noted. water just drowns the atty. not bad, but it wont work correctly. Drying out the atty is bad tho, pops attys.