Remove the lid of the container and confirm that the inside is clean. The container can be anything from an old jelly jar to a margarine tub, as long as it is relatively airtight.
Mix equal parts ordinary white glue and water to make the decoupage paste. Start by filling one-third of your container with white glue. You can use less or more depending on how much paste you think you need.
Pour in an equal amount of water. If you filled one-third of your container with glue, fill another one-third with water.
Stir the paste until it is uniformly smooth. Put the lid on the container until you need the paste.