If you’re talking about a matter of months,
I’d just leave the bottles at room temperature,
but if wanting to store for years, the
freezer would be the best way to store them.
If you have so much hair that a high percentage
of the spray is not reaching the skin but
adheres to the hairs, then you have a loss
of efficiency. Using clippers to trim the hair
to 1/4 inch would improve that and also
improve appearance.