It sounds like you are already well on top of it. Here are my thoughts, which you probably already have covered:

There are disposable meters that come with a supply bottle of test strips, with the meter built into the cap. They make handy backups, and can be given out to others who may have temporary care of your son frequently or in an emergency.

It might be a useful review for you and your wife to take a full diabetes education course.

Keep photocopies of your Rx's and medical records, and ask your son's doctor for an "emergency" Rx for all insulin and supplies, kept unfilled, and replaced every six months. This will be very handy in a disaster. Although you can still get diabetic stuff in an emergency, this can cut the hassle, and having a recent unfilled Rx will let you conveniently restock at the first open pharmacy you come to.

Look into portable electric or evaporative coolers for emergency/disaster and travel storage.

Make sure your son wears a medic-alert device and that his teachers, relatives, and friends' parents are all aware of what to do in an emergency.

Obtain and learn how and when to use a Glucogon injector from your doctor, for emergency treatment of hypoglycemia when the patient is too unresponsive to safely ingest carbs orally.

Keep plenty of glucose tabs handy in various places and pass them around. I prefer these over ordinary sweets because you know just how many carbs you are giving, and they are less likely to get accidentally consumed.

Investigate some of the diabetes management software now available, like that from One Touch, which can download data from a meter.

Have an Endocrinologist manage his diabetes, rather than a GP, at least initially.

Jeff