Liquid vs Gel

Gu is a gel.  This works great if you are using disposable foil pouches. However, it doesn't dispense easily from a reusable bottle like a Gu Flask.  In fact, those who use real Gu with the Gu Flask usually resort to adding water.  Essentially, they have to try and turn the gel into a liquid.  For home made sport food, there is little point in making a gel.  Liquids are both easier to create and easier to dispense.