"I'm pretty sure it's normal to bathe the inside of your mouth by opening it and dunking your head in the water. I know it looks like we're drinking the water, but we're not. Just trust me on this."

I like how these sentences do not use nay kind of connection between verbs. You can never just guess if you can't remember the word.

Does the verb here for drinking mean any beverage? Is there a specific verb for alcohol or non alcoholic beverages?

How about a bathtub of beer -- keep them guessing!

I said taking a bath, and got it wrong..

"rather" is perfectly good IMO