I Am Planning On Converting The Single Sink In Our Main Bathroom Into A Double Sink Vanity Top.. The Plumbing Is Centered On The Wall Behind The Cabinets. Are There Any Special Tips I Need To Know? Is There A Simple "conversion Kit" Sold At A Hardware Store? Any Help Will Be Appreciated.
Look under your undoubtedly dual-bowl kitchen sink
Seriously speaking, any home improvement shop should have what you need. The bigger question might be will the vanity clear the plumbing? Are there any structural parts of the vanity that are in the way of the drain from the wall / supplies? If not, it should be a pretty simple matter to connect both drains to the single.
Not sure about sharing the water supplies though - maybe they make a dual-shutoff valve.