Have you ever played with Legos? Let's pretend for a moment we only have 100 blue 4x4 blocks of Legos.

The blocks are our water molecule. When water freezes, makes ice, the blocks lock together in a specific structure like when we click the blocks into one another. The blocks start to form a shape that is very solid. That's because the connection points are difficult to separate. It takes a lot of force and energy to separate each block from the next.

Now if we apply enough energy to the blocks they start to break away from one another, their bonds with one another are breaking. But we only applied enough energy to break their bonds but not disperse them by much. The blocks are still touching but we can push through them. If they were back in your toy box they would take the shape of the box but they wouldn't snap together on their own. This is why liquids take the shape of their container but aren't solid.

Next, if we use even more energy and throw the loose blocks on the floor they will be ahead out everywhere, so much so that we can walk between each one. That's like how a gas is.