Only thing I can think to thicken it, is to leave some out (don't try to do it all at once) exposed to air so some of the moisture evaporates, then stir. Do maybe a week's worth at a time. Won't work in an extremely humid environment though. As for moisture, I don't know, but I usually put a little oil in my hand (jojoba, lanolin, or something like Carols Daughter, etc), then my blob of gel, mix it all with my hands, and apply it to my hair. That usually keeps it from being too drying. However, if it turns lumpy and clotty while you mix the oil and gel in your hand, don't apply it, that means the gel isn't compatible with an oil.