Hi Simon,
I must admit that your posts are making me quite concerned.
You are getting lots of suggestions and advice, but you don't seem to be taking one central fact on board:
This is your health, and nothing takes priority over that.
with a secondary followup that this is your career, and if you lose that, through not taking care of yourself, then your life will change out of all recognition.
If you are experiencing non-responsive hypos, and are going long stretched without food, then you need to do something about it, as a priority.
Simply saying 'I don't have time to eat' is simply not good enough.
Likewise, 'I am too busy to prep and organise food' is also a massive FAIL.
An avoidable fail.
I bet you have priorities in your life that you would never drop. You attend meetings. You prep for classes. Don't you?
Well, the time has now come for you to add new priorities, and they should come before meetings and classroom prep.
There are many, many different snack options that you can arrange to eat on the run.
Cubes of cheese.
Those dried slices of banana you can buy in bags.
chocolate.
slices of chorizo.
adding cream to your coffees
I have attended many meetings where people arrive, explain they missed lunch and then get their sandwiches out.
And I am quite sure that as a science teacher you are more than capable of using the opportunity of a blood test and a brief explanation of why you need to eat a glucose tab as a learning opportunity for your class. Think how useful that could be to them in the future, if they ever have a T1 class member, or a family member with diabetes.
I strongly urge you to stop looking for reasons why you can't do the things that you obviously need to do, and instead work out ways to introduce those things into your life as a priority. Start now. Organise easy bite sized snacks. Pack them in easy to access ways, and make sure you eat one between classes tomorrow - even if it means having them in your pocket and munching them on the move.
And finally, if you truly, genuinely, feel that you are so time poor that you cannot arrange snacks and eat them, in order to avoid a hypo, then please get yourself signed up for a time management course, because there is no one who is genuinely in that situation.
I am sorry if this post seems harsh. ~It isn't intended that way. I have myself been through a 3 year period of my life when I spent around 7 hours a day in the house, 6.5 hours of it sleeping. One day off a week. So I really do understand the challenges of eating on the run, but it also qualifies me to tell you that the consequences of NOT taking care of yourself NOW are going to be much worse than the minor hassle of getting organised and staying healthy.