Um, you can't replace it with 20% vodka, just to be on the safe side. You can use a TINY amount of alcohol in your
vape if you must, but not 20% and distilled water is probably MUCH safer in any case. There really isn't anything wonderful about inhaling alcohol, it's much nicer (and probably HEALTHIER even, depending on amounts) to drink it instead.
My good old Russian Heritage wants to egg you on, but really, please don't put much vodka (or even water) in your vape. They probably both thin enough at MUCH smaller amounts with VG. I use max VG (sensitive to PG) and sometimes will put a drop or two in my vape. One or two DROPS of H20 per
tank seems to do the trick.
Anna