I had copied these recipes for homemade starch from previous posts:
Homemade spray starch recipe
This is a great money saver and it does an excellent job.
Dissolve 1 teaspoon to 1 tablespoon cornstarch (depending on amount of stiffness you want) in a few tablespoons of cold water in a heat proof 2-cup measuring container. Add boiling water to make one cup, stirring constantly. Then add cold water to the 2 cup line. Let cool and use in a spray bottle.
Shake it every time you spray.
You may have to dilute it a little if it is too thick or builds up white flakes.
Discard after a week or so and make a new batch. You can also refrigerate between using to keep it fresher.
------
I heard of people making homemade spray starch and adding a small amount of clear vodka to help it last longer, i thnk about 2 oz of vodka to a recipe similar to this site:
http://tipnut.com/homemade-lavender-starch-recipe/
------
Lavender Linen Starch
Dissolve 1 tablespoon cornstarch in 1 pint cold water. Add 6 drops of lavender essential oil. Place in a spray bottle. Shake before using.
Fresh pressed linens, nicely starched, and lavender fragrance wafting in the air. Nice!