My best friend’s little brother’s eardrum burst when we were kids when we were swimming. He came up saying his ear really hurt and his mom said you’re fine. He kept swimming for a bit and then started complaining again. She told him that he just had water in it and it would eventually come out. He kept complaining. She went into the house and thought she was grabbing hydrogen peroxide to pour down and flush the water out. It was rubbing alcohol. She poured it in, he screamed and then passed out.
So you could just do that.