There are various ways to make homemade glue, including basic flour glue, flour and sugar glue, and cornstarch pastes. Historically, these glues were often used before commercial glues were available.
The most basic homemade glue is made with flour and water alone. Use a third of a cup of water for every half cup of flour, and simply mix the two together in a bowl until the glue is smooth. This glue is used immediately after mixing and is good for small, paper craft projects.
For a more resilient flour glue, use one cup of flour, one third of a cup of sugar, one cup of water and one teaspoon of vinegar. Mix the flour and sugar in a saucepan, and then add the water and vinegar. Mix thoroughly and cook over medium heat until the mixture thickens.
To make cornstarch paste, you need one cup of cold water, two tablespoons of cornstarch, two tablespoons of corn syrup and one teaspoon of white vinegar. Mix three quarters of the water, along with the vinegar and corn syrup in a small saucepan over medium heat and bring to a boil. Thoroughly mix the remaining water with the corn starch, and then add this paste to the boiling mixture. Cook the full mixture for one minute and then remove it from the heat. Cornstarch paste and flour and sugar glue last two to four weeks in a sealed container stored in the refrigerator.