Grab a mixing bowl and pour in the milk. Add the white vinegar and baking soda.

You will note the solid lumps that are beginning to form. Continue to mix as the liquid solidifies for a minute.

Strain the mixture by using a coffee filter over a glass.

Place the mixture back in the bowl and add a ½ teaspoon of baking soda. Continue to stir until the mixture starts to resemble oobleck.