Definetly make your own. Cheaper and no sugar alcohols that way.

The endulge my son could handle, but the carbolite ones made for a messy accident. I can't go near any sugar alcohols anymore without adverse effects.

Some of the sugar alcohols are absorbed, and they do contribute calories. How much is absorbed depends on the type. Makeing your own using splenda (which does have trace carbs from the fillers) or stevia (pure extract has 0 carbs) is a much safer way to play it.