Thinning Tacky Glue

I've got a bottle of Alene's Tacky Glue that's too tacky, too thick. I know you can thin Elmer's Glue-All with water, will this work on Tacky Glue also?
I've also got a bottle of Elmer's School Glue, which is just about useless for models. Are these all PVA glues? Would it work to thin out Tacky Glue with School Glue?