Mine is a water bottle, but it's about the same. If I even pick it up, or - horrors - shake it, he is an unhappy camper. He doesn't need to be sprayed. But, I will if needed.
He, too, loves water, but goodness forbid some of his fur gets wet via the bottle! It's silly, but I don't complain because it works. And, if a little water works, then I don't want him to get wise and realize that it's no big deal to the point where it doesn't work anymore!
I think that you are safer because of Charlie's barking.
When we lost Tilde I couldn't sleep well at night. Since we've had Krypto, I sleep like a log!
Love All Life, Thank You For Posting! :)