Water can be a solid! Water can be solid when the molecules in the water are packed tightly together. This usually happens when the water gets cold. A great example of this is… ICE! Ice is water in its solid state.
Water can be a liquid! That is what we usually think of water. This happens when the temperature gets hot, but not too hot. The molecules in the water are evenly spaced out so that the water takes the shape of whatever container it is in.
Water can be a gas called Water Vapor. Water Vapor molecules have a lot of space in between them. This makes vapor have no size or shape. When you boil water on a stove (212 F or 100 C), the water turns into a gas.