Keeping it cold is a problem. It's delicate stuff.
For most power outtages, the generators (1 + 1 backup) are the first line.

Second line are the freezer packs and the real thick styrofoam coolers they send the frozen steaks in (these keep things cold about 2x longer than other coolers). I also have 2 12 volt mini-fridges; I can use these in the car or any place I can get 12 volt. I'd like to find a way to power these with solar cells-- its on my list of things to do.

Next, (and I have never tried it) is evaporation cooling. You take cotton towels etc, wet them down and put the vials inside the towels. Natural evaporation will cool it down below the critical temperature. This is a time when cotton=cool can be a good thing.

Finally, if you can keep it at around 68-72 degrees Fahrenheit, most insulin will keep for 30 days. Your wine cellar perhaps?

Every brand is different, and other things like too much agitation and exposure to light can reduce its lifetime.