I use it as a substitute for Best Press. I think the formula is 1 cup of H20, 2 oz vodka and a few drops of essential oil but you can skip the oil because it's just for the scent. I don't really measure. I just almost fill my spray bottle with water, pour in some of my husband's vodka and I add only 2 drops of essential oil in a linen scent. Mix it up really well and it works great and is cheap, especially since DH doesn't know I use his vodka, LOL.
I like the occasional martini but not while sewing or pressing!
If you do a QB search for Best Press you'll see all kinds of discussions on this topic. Good luck with however you decide to use the vodka!!