I use these 801 cartridges, they're 50 cents at madvapes, you can get a fistful for a ten spot.

I drip 10 drops into the stuffing (I go slow, it takes a few seconds before a new cart will start accepting juice) .. then put an old 510 condom over the end to seal it, fill the next one .. you can pre-fill several and those 510 condoms keep them fresh and pretty leak-free.
Yummy

I drip 10 drops into the stuffing (I go slow, it takes a few seconds before a new cart will start accepting juice) .. then put an old 510 condom over the end to seal it, fill the next one .. you can pre-fill several and those 510 condoms keep them fresh and pretty leak-free.
Yummy