Look at our sig. We had a cat with diabetes for 10 years. Went camping with us for the entire time. It was simply too expensive to have someone else watch him and give him shots. He was on glargine (lantus). It was the only insulin at the time that would bring his blood sugar down. Research has shown that cats treated with glargine early on may actually get to the point that they don't need insulin.
So I can't help you with the specifics of the type of insulin you are using, but we just kept the glargine in the refrigerator. Gave him his shots twice a day. We also had a meter so we could test his glucose levels whenever we needed to. If you haven't done so, learn to do blood glucose measurements on your cat. They don't like it, but it's a necessity to maintain good blood glucose levels.
Biggest issue we would have would be to forget the insulin at home and have to have our vet call in a prescription to the local pharmacy.
Our cat travelled to more than a dozen states during his camping adventures. We typically travelled 6 or more weeks a year with him. He lived with diabetes for more than half his life.