I have a variety of plugs, wedges and nerf balls on hand. I hope to never use them, but am that kind of guy. Spent many hours in the wet trainer (go to 4:10 in)
,and I guess the lessons stuck. I only had to deal with one major high pressure seawater leak on our boat, and I used a pencil and some duct tape. The wooden plugs in the DC kit were all too big.