You might get better/quicker responses if you hit "report" on your thread and ask a moderator to move it to "Dive Medicine". Or, you could just post it in that forum.
Personally, I've had water stuck in my ears after diving. Ignored it, and kept diving without incident. I can't say for sure you will have the same experience, but that's been mine. I do pack "swim ear" when I go diving, and put it in my ears after most dives. You can often find ear drops at dive shops or over the counter at pharmacies. Alternatively, some use a mixture of peroxide and vinegar. I've never used that so I couldn't advise you on the exact mix.
If you can't find any, ask your boat crew. Most boats I've been on have a small supply of stuff like that for crew use and most people will share if asked politely.