I take my plugs out after every ride. The drive home will push out any water that may have intruded. I live in an area where it's all Salt Water or Brackish water. Doing the riding I do, I ALWAYS get some water in the hull. I ride very hard and do 180° flat spins, hard turns with the VTS all the way up and also, jump a lot of wakes/waves. Sometimes, I flip the ski. So pulling the plugs out and putting them with the DESS key in the center box ensures I see them before each ride.
On previous ski's I've owned, I've lost the plug(s). I just buy brass ones from Lowe's and use those. Drill a small hole through the square tightening post and then, attach a lanyard from there to the rear tiedowns on the Ski. If the plug ever does come out on it's own, it's hanging right there. Also, once I do this, I can just let them hang and you notice them when it's time to put in. Which is what I'm going to do this weekend. That way, I can keep the plastic ones in the center console as extras. If you aren't doing basic 360° checks around your Ski before putting in, you're doing it wrong any way.