Put funnel into the water bottle, and pour flour through it.
Stretch the balloon around the opening of the water bottle.
Turn water bottle upside down and gently squeeze the flour into the balloon. Make sure to use some pressure because the air helps the balloon open up so the flour can all go in.
After the flour is all in, pinch the balloon and release it from the bottle. The balloon should have a snug fit to the flour inside it. Just make sure there isn’t any extra air the balloon.
Tie the balloon and wipe away any excess flour from the outside. All ready to squeeze away stress and have fun!