ketogirl
You probably do not understand the difference between type 1 and type 2 diabetes.
With type 1 diabetes one can try to reduce carb intake to reduce one's insulin needs. Indeed, one can go very low carb and reduce one's insulin considerably.
BUT: it is not possible to 'control' type 1 without insulin and by diet alone. No-one is mentioning this as an option because it is not an option. A diet that consisted exclusively of protein, for example, still needs insulin.
Before insulin was discovered, people who developed type 1 tried to extend their life by eating as little carbohydrate as they could as the only possible treatment for their condition. It did not help them: they died, essentially of starvation.
On the more general topic of insulin and pump supplies. These are really tips more for emergency situations than recommended practice, but nonetheless...
I fairly often had to spend time in countries where there is no way I would be able to get hold of either more insulin or pump supplies.
I know it is not recommended, but I often kept the needle in the same site for 4 days at a time rather than run the risk of running low on pump supplies. The only problem that I faced was that around the fourth day the pump site would HAVE to be changed as insulin absorption would get worse.
Also, on insulin and temperature:
long, long ago I travelled around Asia for months as a backpacker, carrying insulin and no access to refrigeration. I actually spoke on the phone to the company that produced insulin before doing this (wanted to know before setting out if this would kill me or if it was do-able) to find out more about the temperatures the insulin would tolerate.
Paraphrased: if the insulin freezes it will no longer work. However, it can normally remain at normal room temperature without issue for a lot longer than what is recommended. What they recommend is extremely conservative compared to what the insulin can actually tolerate.
The stuff I was using was exposed to fairly high temperatures for about three months, then was stored in a not very good fridge and still used for the next 1 and a half years, and had still not deteriorated.
So the bottom line from that, as I understand it, is that if you get insulin from abroad, getting it in a way where it could be exposed to extreme cold en route is bad, but exposure to normal temperatures along the way is much less of a concern.