[Margaret Pilkington]

You could take a picture of a sign that tells you that Wi-fi is available at a particular location...like the Market Hall for instance.
Sometimes you have to be a bit inventive with interpretation of subjects...or use some imagination.......You could photograph a lake, a canal or just puddle to show that life would be difficult if the water were not available.......A high hill top might be suggestive of an airy place...none of us would survive very long without air......or you could picture a huge tree.....aren't trees the lungs of the world.
The possibilities are endless if you just put in a little bit of thought.