clif bars- easy, don't really freeze especially if you keep one in an inner pocket and they are a good mix of simple sugars, protein and complex carbs.
Acellerade in my pack-
starbucks instant coffee folks! I am pretty sure it was Don Denver who showed me this. shove a bunch of these in your pack or pockets. Score some free water and either drink cold or hot. I have even poured them into my mouth. this is not a good idea,but in a pinch, its a good caffeine fix.