Because the single most important thing that separates reps (even high end ones) from gens is the total absence of QC, I would not take any rep into the water unless it has been checked first. Caseback has to be tightened, gaskets greased and crystal checked. Then - if all is ok - most (non chrono) sporty watches with screw on crowns (subs, PO, SFSO, PAMS) can be used for showering and swimming.
Try