How To Make A Homemade Stress Ball Simple Diy Instructions To make a stress ball, slip a funnel into the neck of a sturdy balloon. if you want to make a firm stress ball, pour flour, baking soda, or cornstarch into the balloon. if you want your stress ball to be softer, use lentils, split peas, or fine play sand. you can also mix a little rice into your filling if you like. diy stress balls: funnel cornstarch into a balloon (optionadd water to the. How Do You Make A Stress Ball With Cornstarch And Water Diy stress balls: funnel cornstarch into a balloon (optionadd water to the. 2 ingredient fluffy cloud dough 2 parts cornstarch, 1 part conditioner. i used to make this way back in my babysitting days and it was just as fun as i remembered it.. let's make some cornstarch conditioner play dough!.. and tied it up nice and airproof, it would probably make a great stress/squish-ball. Wrap this second balloon over the filled balloon to add a little more strength to your stress ...