You almost certainly can *not* do this. What you suggest is passing off someone else's product as your own; you could possibly run afoul of various intellectual property and unfair competition laws. The way to do this is to private label instead--assuming that the formula is in the public domain, or that you can fairly easily come up with a similar formulation, make the stuff yourself (or hire some manufacturer to make it to your specs) and then put it into your bottle withh your label. That's how, for example, supermarkets and pharmacies put out "house brands" of popular products. They don't repackage another's product, but instead have their own product made. Just be careful that if the formula is itself patented, not to violate patent.