How do i check if the player has drunk the minecraft water bottle?`

Hello. I am trying to make a thirst system for my mod and the last thing i need is to check if the player has used a water bottle. I have the code and it runs well with other items like bread, etc, but i cannot make it specific to water bottles as the 'water bottle' is a Item.POTION, where each other potion is the same. I have read a thread on this but it wasn't explained well enough for me to understand it, and the link had expired. Thanks for the help.