Probably sounds strange, but I've started freezing oranges. Take one with me and in 80+ degree heat is thawed out, but still cold in an hour. I think it makes for a nice treat. On the other hand, I really need to work on my endurance, and don't need to be stopping that soon...

I hope this fall and winter, that a couple frozen oranges will work for long rides.

Tried freezing bananas. Will only work if you like to eat mush.