Very cool -- love to see new and innovative resolution systems!
Favourite detail: refilling the player glass means the GM's timer gets filled a little too! Such a devious little trade-off that keeps the cost of success exciting.
Something I might have liked to see: It would be cool to see a slightly more formalized goalpost for the players! We have a timer for when they lose, but nothing built-in for when they win. I think it's fine that it's more traditional GM judgement, but given the focus on the water mechanic, it would be fun to see how that could be played around with for "winning".