You could leave the bottle out on the counter until it warms up to room temperature to prevent the liquid from absorbing the ambient water. If it were me, I wouldn't want to risk my large bottle of nic getting dilluted down with absorbed water. That would make it very hard to know the exact mg of the nicotine in your final mixes. Thats just my opinion though. Thanks for the reply.
I get mine in amber bottles, and store them in the fridge. The bottles are clearly marked as "Not something to drink" and we don't have little ones running about here.
I make/sell juice locally, so I have the "mother bottle" in the fridge all the time, and the "shuttle bottle" gets refilled as needed and goes out with me and then goes back in the fridge after. I suppose I run a risk of condensation in the bottle, but I haven't see a problem yet.