How do I check if a player right clicks water - 1.8.9

[sploshwazere]

I currently have my code which can currently detect a right click and get the block you clicked so I can do something to that block, when clicking on liquids though it just gets the block behind the water, if there isn't one it just detects it as clicking the air. If someone could show me a way to detect the water that would be helpful. Thank you.