I use rubbing alcohol instead of vodka. Much cheaper and no need to go to the liquor store. I used 90 percent for this first batch but in thinking it through, 50 percent would work too because vodka is 40 percent alcohol.
I use the sta-flo mixed with water and added essential oils for smell. I haven't had a problem with that mix. I like my fabrics stiff so I do a 50/50 mix.