My grandmother's recipe was corn starch and water, cooked on the stove until it wasn't cloudy anymore. I don't know if there was anything else in the recipe, and I don't know the amounts of each ingredient, sadly. I'm sure there's info on the interwebs somewhere, I just haven't bothered to look.
Keep in mind if you use vodka or any other kind of distilled spirit, there IS NO STARCH in that mixture unless you add it in yourself. The starches in the original mash are removed during the distillation process; the starch is basically eaten and fermented by the yeast. However, you can make scented pressing sprays with vodka. Mark Lipinski published a lavender-scented fabric spray that was vodka, water, and lavender essential oil. Very nice on sheets - not that I press my sheets, lol. I just spritz the spray on the sheets and hang in the sun to dry.