In the 1990s, when I was a child living in England (UK), I had an illustrated story book that my mother had bought me which was about a young child who falls into a puddle on a rainy day. When the child is inside the puddle, they are travelling through a 'twisted' reality where shadowy creatures (possibly made of dark water?) are existing in an 'alternative' reality. They were possibly accompanied by a parent on their journey, although I could be wrong about that. I seem to remember that the child makes their way back to the 'normal' world by the end of the story.
Can anybody help me find the name or any information about this book?