For fine motor, motor control and sensory input take shampoo with some color and put it in a large ziplock with a bead. Put a maze to the child's level under and ask them to push the bead through the maze without going outside the lines.
Another cleaver way of reusing milk bottles. In Ceramic practice we cut the bottle in a similar way, like on the photo, and use it as a scoop for dry glaze materials. The bottle also works great as a container for small quantities of glaze.