If you want to make your own white glue, here is a recipe:
White glue is easy to make by combining the right amounts of
milk, distilled vinegar and baking soda. Milk contains a protein called casein. It makes good glue, but not in its liquid form in milk. Adding vinegar causes a chemical reaction that turns the casein into a solid.
How to do it? Heat 2 ounces of 2 percent milk and 1 tablespoon of vinegar, but don't let it boil. The mixture will curdle to the consistency of cottage cheese. Pour it through a
coffee filter to collect the curds. Add a pinch of baking soda to the curds until you get the right gluey consistency. Remember that when you use it, the glue takes a few hours to dry.
Parafilm is expensive here, also. That's why I get it from the blood bank when I donate blood.