Yep absolutely! You'll need to make a new common event which is always checking whether the player is pressing whatever your "confirm" button is. If the player is pressing confirm, make four different conditional branches to see if the player is facing up, down, left or right.
Then you'll need to make two variables that check the player's X and Y coordinates. In the conditional branch for if the player is facing up, subtract -1 from the Y variable. For down, +1 to Y. For left, -1 to X. For right, -1 to Y.
Now make another variable that checks the region of those coordinates. If the variable matches the same number as the water region, increase the Current Thirst variable.
I hope that made sense, haha! Let me know if it's confusing like this and I'll try and screenshot some events