The ideal way to mix eliquid has to be with a bottle roller. This method is used in many situations, mostly lab work. Here is a typial one but there are many variations.
The idea is to turn the bottle very slowly. That's enough to keep the liquid moving, circulating, but it's gentle so no air bubbles. Leaving it running over night would be a LOT of mixing. The problem is most of these suckers are stupid expensive. There has to be a cheap on out there some where. Anybody found one?

The idea is to turn the bottle very slowly. That's enough to keep the liquid moving, circulating, but it's gentle so no air bubbles. Leaving it running over night would be a LOT of mixing. The problem is most of these suckers are stupid expensive. There has to be a cheap on out there some where. Anybody found one?