They can't prepare meat and everything else in the same sink, this would deem the meat not-kosher.
But the truth is that there are NOT two sinks in every Jewish home. Not every Jewish home keeps kosher, plus it is possible to keep kosher with one sink...you would just have to use removable wash basins inside the sink.
In Judaism, dairy and meat are kept completely separate. Those who can afford it may have two kitchens, one for dairy food preparation and one for the preparation of foods containing meat.
Not everyone has two kitchens, some have two fridges and two ovens. Some just have two sets of everything (dishes, pots and pans, etc) but only one oven and fridge.
Most do not. I'm an Orthodox rabbi and have never seen a sink in a Jewish dining room.
Those who do, the extra sink will usually be in its own little alcove adjacent to the dining room or the restroom. It is for the purpose of washing the hands before eating and/or after leaving the restroom, depending on the number of sinks in the home, which ones are located where, etc.
Most do not have two. I've been in lots of Jewish houses, Orthodox, Reform, Conservative, and Hassidic, Ashkenazic and Sephardic, rabbis and laity, wealthy and poor. I've never been in one that had two kitchens. But ...
The Jewish laws that require separating Passover cooking from every day cooking would be much easier to keep if you could just close off your every-day kitchen during Passover, and close it off outside of Passover. And it might be handy to have a separate dairy kitchen distinct from your meat kitchen in order to simplify keeping meat and dairy foods entirely separate. That ends up arguing for 3 or 4 kitchens, but the few genuinely wealthy Jews I've known always seemed to have something better to spend their money on than extra kitchens.
One can purchase corner sinks at local home renovation stores like Home Depot and Lowe's. Online retailers like Amazon also offer corner sinks at a very reasonable price.
Bar sinks are quite easy to find. Most home improvement stores like Lowes and Home Depot will have options for bar sinks and there are many online retailers who also offer bar sinks.
Copper bar sinks can be found for a low price at many home improvement or bar specialty stores. Lowe's, The Home Depot, and Copper Sinks Online all have an inexpensive selection of bar sinks.
Kohler is one of the top rated brands when it comes to sinks, cast iron or otherwise. They are available at Lowe's, Home Depot, and Berry Home Centers.
A stainless steel sink can be found in many home kitchens. People appreciate the fact that it matches their appliances. White sinks are also popular for that reason and because of their clean appearance. A great number of people also prefer that a sink has two bowls instead of only one.
They went back home for the first time in two thousand years, to Israel.
Vessel sinks can be bought at most home improvement and furniture stores. Most will be made of porcelain or stainless steel. Sinks would not be made of glass, as it would be too delicate.
You can find copper kitchen sinks when you go to stores like Canadian Tire, Rona, Lowe's, Home Depot, Home Hardware. You can also purchase the item online at the website of these stores.
New Haven Jewish Home for the Aged was created in 1921.
One can locate wall hung bathrooms sinks at their local home improvement stores including Ace Hardware, Home Depot, and Lowes. You can purchase these items in store or online.
A copper sink can be found in many different home decor stores. One place that is well known and easily found is through Home Depot. They should have copper sinks in stock.
In the living room.