A huge earthquake somewhere years ago reminded me about this, and ever since then I've been keeping ahead on my scripts, always have at least one cartridge spare - up to 3 or 4 sometimes (one is enough to last me ages, a week and a half maybe).
I also have an emergency bag for such occasions... lets hope we never need it. Inside it is spare meds, needles, etc. And more water than anyone else needs just in case the stress makes me high which means super thirst for me!
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T1 LADA, on Lantus & Novo.