I honestly think the snake probably inhaled some of the water and was doing their best to "cough" it back up. Since snakes don't have a diaphragm, this can sometimes looks like they're trying to throw up and can sound really awful. The popping noises are what makes me think it was a choking issue more than a regurge issue.
If it were my snake I'd probably wait and see if they exhibit other signs of a RI, it all seems very coincidental that the snake drank a bunch of water before this happened. There would usually be more signs and they wouldn't onset so suddenly. However, inhaling anything that's not meant to be inhaled can create an environment for bacterial growth, so like I said, monitor your animal. Not saying it's a bad idea to take it to a vet immediately but I don't think it would result in much.