I make a 200ml base 70VG/30PG 4mg nic keep it in a pint mason jar in the fridge.
Anytime I get a new flavor, even the same from a different mfg, I make a 20ml tester.
[Take from fridge, let room temp, stir on mag-mixer, mix]
I always have a tester of any flavor I have, so I can taste before I create something new,
and also it's easy to find a single flavor to vape if I want, or see how one works with
another[since they are aged]. Sometimes I just drip 1,2,3 different flavors on a set of bare
alien claptons [no wick] either to test pairing, or just for fun playing with tastes.
I keep a DB160 with a Velocity V2 just for that purpose.
Anyway, just a suggestion.