one I found on Google
What You'll Need:
1 Tbs. cornstarch
1/4 cup cold water
3 3/4 cup tap water
2-3 drops of fragrant essential oil or lemon juice (optional)
Mix It Up:
Bring 3 3/4 cup tap water to a rolling boil.
While waiting for water to boil, mix the tablespoon of cornstarch into cold water. Stir constantly until cornstarch is completely dissolved.
Once water boils, slowly stir in cornstarch mixture.
If using essential oil or lemon juice, add to mixture and continue to stir for one minute.
Remove from heat and let cool.
After cooling add to a one quart spray bottle.