Pour the flour into the water bottle using a funnel.
Blow up one of the balloons and twist it a bit to ensure the air doesn't escape (do not tie).
Carefully fit the end of the balloon over the mouth of the water bottle.
Now turn the bottle upside down and empty the flour into the balloon.
Slowly let the air out of the balloon.
Get a scissors and cut off the top end of the balloon.
Get the second balloon (the same color as the first) and cut the end off of that one, too.
Discard the skinny end and fit the more circular top of the balloon over the flour-filled balloon.
Repeat steps 7 & 8 with the third balloon of the same color.
Notes
Ensure Secure Sealing: When attaching the balloons to the water bottle and to each other, ensure a secure seal to prevent any flour from leaking out. Take your time to fit the balloons tightly over the bottle's mouth and each other's ends, and consider using a small amount of super glue if needed to reinforce the seal.
Proper Balloon Handling: Be gentle when handling the balloons to avoid tearing or puncturing them. Balloons can be delicate, especially when stretched over the mouth of the bottle or when cutting them. Use sharp scissors to make clean cuts, and handle the balloons with care to prevent any accidents.
Supervise Kids: While making and playing with the squeeze ball can be a fun activity for kids, adult supervision is important, especially when handling small materials like balloons and scissors. Ensure that kids understand the instructions and safety precautions, and provide assistance as needed to avoid any injuries or messes.