I've done this conversion before. I would recommend that you distill your vinegar if you want to make pure sodium acetate. I think all that is commercially done to clean up vinegar is a microfiltration or centrifugation to make it look clear. (but it's not pure or anything)
I'd add baking soda until the dilute acetic acid stops fizzing. Then add about 5% extra dilute acetic acid (or, 5% after the bubbling stops--IIRC, it's something like just under 70g of NaHCO3 for each liter of distilled vinegar). Boil it off, there should be a light (not heavy) smell of vinegar as it boils down. That's your sodium acetate. If you distill the vinegar, it will be white. If not, it will be a gross brownish-black color. Make sure it's good and dry before going on to the next step.
In a 500ml flask add 150g NaOAc, then with good cooling, VERY SLOWLY, VERY, VERY SLOWLY add 270g H2SO4. (you need a large excess of sulfuric acid)
You should be able to to distill off about 85g acetic acid (about 80% yield) before your flask will fill with foam. Collect 110-120C.