Zinc and Quercetin go together very well. Zinc is highly anti-viral and Quercetin opens up the cells to allow zinc to do it's work. I'd highly recommend this combo along with Vitamin C as a preventative measure.
Along with the above, it would be a good idea to keep Apple cider vineger, oil of oregano, black seed oil and elderberry. All of these are protective of the lungs, which is the main target of the virus.