Instead of numbers write the color word on the bottles. Sort pom-poms by color. Empty each bottle and count the pom-poms. Then record how many pom-poms were in each bottle. Add the two colors together for addition practice.
Water transfer with a sponge - practice squeezing and transferring from one bowl to another. This post also shares who to use a baster, a funnel and a pitcher with water play and fine motor skills (Pour Water Activities)