I am looking for a book I had a child. It would be likely from the 80’s or 90’s. It was about a girl [or may be a girl and her cousin] having a bath and they dive down into the depths of the tub until they are swimming in the ocean, and they come out the other side and meet the owl and the pussycat in their Pea green boat. They go on some type of adventure and end up back at home for bedtime. I’ve been racking my brain for a LONG TIME on this one.