If you want a ratio of Vinegar and Vodka close to redsea's nopox you can make up 1 liter of 590ml Vinegar to 410ml vodka and use pretty much the same dosing schedule.
I personally like a ratio weighed more toward vinegar via a ratio another forum member was using well before nopox came on the scene. He uses approximately 690ml vinegar to 310ml vodka.
All assuming 80 proof vodka and 5% vinegar. I used that ratio very successfully myself for a while.
I would just buy cheap store brand vinegar and Barton's vodka which I could get a large bottle for under $10 locally.