Gather all your supplies to get started.

Make sure to have plenty of paper towels to catch the spills and disposable cups to help you mix the paste.

Mix in the flour and water in the right ratio, making sure to add the water gradually and to keep stirring to avoid lumps. Depending on the flour you use and its starch quotient, the consistency of the paste will vary. You can also use your fingers and hands to mix the paste.

Once the paste is ready, you can start making the funnel. Grab a water bottle and cut off the top part where the mouth is. Remove the cap and set it aside.

Once you’ve picked out your balloon, go ahead and blow it up to stretch it. The stretchier the balloon, the more paste you can fill it with.

Next, fit the mouth of the balloon over the bottle’s mouth and secure it over the rim firmly.

Pour the paste into the funnel-like opening of the bottle and allow it to fill up the balloon.

When you’re satisfied with how squishy it is, just twist the neck of the balloon a few times before removing the mouth from the bottle. This will help avoid any spillage.

Simply fasten off with a knot or two to secure your stress ball.

Another option–a quicker and less-messy one–is to fill the balloon in question with toothpaste directly from the tube itself. Since the toothpaste is made from non-perishable substances, it will also last longer!

Finally, don’t forget to draw emojis and quirky faces on the stress balls, and you’re all set!