In my case being Type 1 insulin dependent and spontaneous exercise is just an impossibility. There has to be some preparation. As my chosen exercise is longer distance off road running and Triathlon and Marathon (I have run 15), I'm used to getting prepared. A blood test first is preferable but can be missed if you are feeling good. What cannot be avoided is carrying some form of fast acting carbohydrate with you on the move (or keeping on the side lines for team sports). I have used glucose tablets (a bit dry), jelly babies (more easy to chew), running gel sachets and special running carbohydrate drink powder mixes (see SIS sports for some), and commercial offerings like the supermarket lucozade copies - personally I find lucozade very "synthetic" to taste. For your particular issue I think I would recommend the gel sachets as they are easy to pocket and or carry. have robust packaging, and are quick acting. I have seen them in my local but rather large Tescos but also available from some sports running shops and of course internet mail order.
Its not really that much preparation, same thing every time, but then I try to carry glucose tablets when ever I am out of the house so running is no different.
Paul
Type 1 March 1982
London Marathon x 7 first one in 1983
Southend Marathon x 1
Beachy Head Marathon x 7
Triathlon x lots