You can't freeze nic, but you can keep it in the freezer. Regarding condensation, outside the bottle doesn't count. It's moisture that gets inside the bottle that can be destructive.
Also, in the most recent thread linked to by Papa Sloth, chemist Kurt theorizes that there can be an exothermic reaction with some already-flavored juice which refrigerator storage can accelerate, resulting in vinegar production or worse. The spoilage problem reported by Sun Vaporer in that thread does not seem to be common, but there's no indication that refrigerator storage offers any benefit for flavored juices. Several people in this thread have already made such statements and now that I'm an expert

I'll join the chorus.
On a related note, keep the cap on when you remove a bottle from the freezer until the juice has warmed to room temperature because if you take the cap off, moisture will be drawn in at an especially fast rate as the juice warms.
100% agreement here. If I knew then what I know now I'd have skipped syringes altogether and just purchased a 10ml and a 100ml graduated cylinder. Maybe a 50ml instead of or in addition to the 100ml. I really like my plastic 50ml graduated cylinder because of the clarity of the blue markings. They're easier for me to read than the red markings on my 100ml glass cylinder. The smaller the diameter of the cylinder, the further apart are the markings of course, which is another reason that I tend to reach for the 50ml cylinder instead of the 100ml cylinder if I don't need the extra capacity.
Regarding shooting needles: are you certain that the needle doesn't have a Luer Lock that can be secured with a twist? I used my blunt 4" needles for months before realizing that they could be locked into place.
Side note on measuring: All of the liquids we use for vaping have an unlevel surface at the top when put into a container. The surface is concave (it dips down in the center). The center is called the meniscus. The curved surface can be more pronounced in a glass cylinder than in a plastic cylinder. For the most accurate measuring technique, have the cylinder (or syringe, or beaker) at eye level and read your measurement at the meniscus (the LOWEST part in the center of the cylinder).