If you exercise daily then your body needs glucose. Also, if you have been living on a high carb diet for all your life, your body will have problems on going carb free.
Frostymug has good advice about dextrose. If you want to be really cautious then take only 2-3 sips every 10-15 minutes of your dextrose solution. That way it won't get accumulated in your small intestine and it will also be digested easily.