I thought I was all set to go through the kind donation of a homebrewing friend and picking up an airlock and yeast. Now I see I am missing a hyrdrometer, sulfite, yeast nutrient and energizer. Can I plunge in or should I wait for my next trip to the big city to get the last few things? Is sulfite really necessary? I tend to get headaches from wine and someone said it might be the sulfites.