1. Water-based nail polish: This is a type of nail polish that uses water as its main solvent instead of traditional solvents like acetone or alcohol. It's often marketed as being safer and less harsh on nails than traditional nail polish. You can find this type of nail polish in stores.
2. Nail polish diluted with water: This is not a common practice. Nail polish is designed to be a concentrated solution of pigments and polymers, and diluting it with water would likely make it unusable. The water would separate from the polish, making it thin and watery, and it wouldn't adhere to the nails properly.
If you're looking for a safer and less harsh nail polish option, look for water-based nail polish. If you're trying to make nail polish thinner, avoid diluting it with water.