Yes, water is typically used with paint by numbers to create the paint mixture. The paint is usually powdered; water is added to make a paste-like consistency. The amount of water used will depend on the specific paint and the desired consistency, but generally, a small amount of water is added to the paint and mixed well.
It's important to note that the ratio of paint to water can affect the final result of the painting. Too much water can make the paint too thin and runny, which can cause it to spread beyond the boundaries of the numbers and create a blurry or uneven finish. On the other hand, too little water can make the paint too thick and difficult to spread evenly.
It's recommended to start with a small amount of water and gradually add more as needed to achieve the desired consistency. Some paint by numbers kits may also include specific instructions for mixing the paint and water, so following those guidelines is best for the best results.