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You will be amazed at what it costs to make a 12oz glass of juice.
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This, I have made my own for years. I do runs of 6 bottles of 250ml each and my cost is nearly non existent.
I get flavors and raw pg and vg from flavorist apprentice (subdivision of perfumers apprentice). I got a pro account to buy in the larger sizes, and my normal order is 3 gallons vg, 1 gallon pg, a few 16 ounce bottles of my go to flavor, and some smaller sizes to try out. You will only have to make that order every couple years.
For nicotine base, I have a local shop that does vg based at 100mg, so every 6 months or so, I'll go grab a bottle from them, but I dont use much nicotine in mine.
My normal technique is as follows......
1. Pour about 100ml of premixed pg/vg into a 500ml beamer
2. Add flavor (most of my recipes end up at or under 25ml so that is the beaker size I use).
3. Add nicorine base. I like 2mg/ml, so it is only 5ml for me.
4. Add more pg/vg mix until you get to 250ml, then funnel that into a 8oz bottle.
5. Wash the beakers and funnel and repeat.
6. When all are made, shake well for a minute and store to steep.
All the beakers and funnel can be had on Amazon relatively cheap. Good luck.