Come up with another way to display the water level and even display the optimum level.

CodeBug has 4 legs that can detect analogue values, try looking after more than one plant with your CodeBug.

Try attaching an alert to your project, such as a sounder or some GlowBugs to grab your attention when your plant is thirsty. You could also make your project light sensing and turn on a light automatically when it gets dark.