There’s a movie that I watch as a child, late 80s, probably 90s. It was on TV, we recorded it on a VHS to watch. I think it was a kids halloween movie. There were 2 kids (brother and sister possibly) And the water mill in their town was running dry. I can’t remember the adventure, but I remember the boy at the end, making a wish and skipping a rock into the dried up part where the mill was, and it magically skipped 3 times and apparently that meant his wish would come true and water appeared in the mill once again. Please help. This has been driving my crazy! Thanks!