As above, the resin is not soluble in water. It floats on top, just like oil would.

In any case, it doesn't really matter. The partially printed layers happen at the top of the resin. The water is at the bottom of the resin. The only things that would cause the two to come into contact are:

(1) There's turbulence or waves in the print bath, causing water to slosh over the job. In this case your job is ruined anyway, because the Peachy relies on the top surface being flat.

(2) There is no resin layer because you've run out of resin. In this case the job can't be finished anyway.