I sell it in the dark bottles so it don't spoil. Sunshine will make it spoil, but only over a long, long time. You really don't have to worry about it though, it take a really long time in the sun to go bad, might even be a year!
Spray bottle or dropper bottle or jar, its really all personal preference depending how you fish. But yeah, it might not spray well if it's cold, it's an oil and does get thick in cold weather, but it won't freeze. Just keep it in your pocket if you're ice fishing would be my suggestion.
Thanks all, Slabsauce rocks.