PowerAde Zero is diabetic friendly and has the electrolytes, plus it tastes really good. I carry those Nuun tablets when I'll be refilling water bottles but the PowerAde Zero is cheap and you can find it at lots of stores.
If your diabetes is well-controlled and you stay hydrated, then riding 34 miles shouldn't be a problem. If you're also on blood pressure meds, then using an electrolyte solution might be especially important for you. I had problems with that last summer...was taking a low dose of lisinopril and I felt okay when I was riding, but then I'd get off the bike at the trailhead and black out and it turned out that my blood pressure was too low. If you use insulin or you have a problem with your sugar going low when you exercise, then you might want to pack a few snacks in case you need them, and bring your meter.