Add 2x18mg nic shots to 100ml of e-juice for 3mg, 5 of them to a 250ml bottle (assuming thats 250ml of juice and not 200ml with space for 250ml)For 100ml bottles I use a single Nic shot, which according to the calcs works out to about 3mg.
So by that reckoning, 2½ shots would do you per 250ml.
However, be aware that it will alter your PG/VG ratio, depending on which the shot is based on. Usually they're VG, I find, which can be a problem in some MTL vapes.
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