All of the water supply pipes start under the kitchen sink, and head for their destinations from there. If you simply cut and cap them under the kitchen sink, that would shut down the bathroom sink and shower, and the outside shower, and you could pull all of their supply piping out. The toilet does not use fresh water, of course, so you have no supply pipe there.
The drain system is a little trickier because the inlet to the gray tank is directly under the tub drain. You can remove the tub by basically lifting it straight up (you may have to cut the tub's drain pipe, rather than simply pull it apart). But you have to preserve the drain pipe from the kitchen sink to the gray tank. I believe it runs under the floor, though for 1993 I'm not sure. And you have to preserve the outlet connection from the gray tank, but it is entirely under the floor, so there is no real issue. .
And of course you have to pull up the toilet, and cover and seal the hole in the floor where the big toilet drain pipe drops down through. You can either cut and seal that drain pipe under the floor, or cut and remove the entire drain pipe all the way to the slide valve, leaving the valve in place to seal it.
Overall, I don't think this is a hard job. I'm not sure why you would want to do it, but that is not my business. You will, of course, end up with some minor carpentry to do, to cover the newly opened areas in the walls and floor.
Bill
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