Pour water into a small saucepan. Add agar agar powder and stir.
Bring the mixture to a boil. Keep stirring the mixture and let boil 1 minute.
Take the saucepan off the heat and allow to cool 1 minute. Pour the mixture into the container.
Add bentonite clay, rice flour, and oatmeal to the container.
Secure the lid on the container. This is a hot liquid, so make sure the lid is on tight!
Carefully shake the container to combine ingredients.
Pour the contents into a small dish or mixing bowl.
Let the mixture cool down to room temperature 10 minutes. It will start to thicken.