http://www.tudiabetes.org/group/diabeticswhorunmarathons has a lot of info! I'm sure they don't mind sharing with people running half-marathons! A bunch of folks there have kept on and off postings going back several years. If I need to recall any of my "war stories" from my 2011 training season, I can scroll back in the main thread to refresh my memory and there's a *ton* of info.
I use an Amphipod fuel belt and usually will lug a bottle or two of Gatorade (I buy the kind you mix as 1) it's cheaper and 2) you can weigh it to put however many carbs you find you need...) along on runs > about 6 miles.
I put my pump on it in the pic and usually belay the tube under the "flap" pocket (there are also zipper pockets I use for important stuff like keys, money, my magic NZ greenstone, etc...) and it works great. There's clips for the drink bottles. I don't usually lug them along in races b/c they have drinks along most courses. I also use little baggies of Starburst Jelly beans and Smarties. The Smarties have dextrose (like Gatorade...) so perhaps they work faster but they are a bit dry and the jelly beans help with that. I mostly bring those for "emergencies" (ha) and try to just use the Gatorade for fuel. I put the Smartie Beans in little bags from a hobby store:
The final "gear" tip I'd toss out is Race Ready Shorts as they have 7 (!!!) pockets, including a large mesh pocket that will hold a One Touch Ultra Mini Meter securely for 26.2 miles (at least, that's the farthest I've run though...). Jerry Nairn who has run like 50 or 60 (at least...) marathons and is in Sherri Colberg's book, mentioned them in the group and they are seriously handy. There's two velcro flap pockets that will each hold a back of the beans and a large car key, if you have one of these large car keys, which is very handy for "running naked" as I refer to running without the belt. It's a great idea to have all your gear, particularly your meter, to test things out. I don't take it all the time any more as I've sort of got a routine but if I spend $$$ on a race, I will bring it along because I want to have a good run and would be pissed if diabetes got in the way!
Re the running, the main way to figure out fueling, etc. is to run and test. I have a CGM too which proved to be *immensely* helpful, although I did most of the training for my first 1/2 without it, it got there the week before but, as I didn't have the right kind of tape (I'd rx Opsite flexifix...it's great stuff!!), it fell off 3 miles into it so no data, I probably pulled over and tested on the way or whatever. These days, I find that I can go 3 miles on about 8-12G of carbs and can stay pretty flat. If I get home from work and am about 90, I'll get ready to run, have a glass of skim milk (8ish G...) and run, get a "predicted high" bleep on my CGM at about a mile (8-9 min...) into it and then a "predicted low" by the time I get home after 3 miles (my usual mid-week training run...). For longer runs, 6+ miles, I'll put my basal to 50-60% of the normal most of the time and try to have a swig of gatorade, again about 8G of carbs every 3 miles or so. This seems pretty close to "drink stations" at races so I figure I'm probably doing ok. Good luck and have a great race! Sorry for the lengthy post!