Go ahead and
buy a couple litres of nic and put it in the freezer. I have a half litre in the freezer split up into 15ml bottles. At my consumption rate I have maybe 3 years worth in there. I have been
vaping 5 months and have used under 30 ml of 100mg nicotine.
Nic is sold on amazon as a nicotine lozenge refill at up to 100 mg strength. And the nic lozenges are FDA approved.