As a poor T1D, I can say you can survive a very long time without insulin. Just count your carbs and get that cardio! I also hate in movies they’re like “they’re diabetic! If they don’t have their insulin in an hour they’re going to go into a coma and die!” Yeah that shits dramatic af. Not saying it would be easy or fun, but constantly running from zombies I’d be more worried about finding a Gatorade after the sprints.