The only thing I can think of is water and cornstarch. That's what I use. You get a plastic baggy and mix hot water and cornstarch. It is a liquid but when force is introduced it becomes a rubbery sold. I have taken a piece of wood, glued in the long part of a wire coat hanger and then I mix up five or so baggies and slide them all on the coat hanger by the tops of the bags. Then take your shot. You can sometimes get more than one shot. Keep in mind it does become a liquid after force is dispersed, so have newspaper or something under it.