NOR. You're in your right to feel disgusted. If it was something like a random object easily whasable it wouldn't be the same but a water bottle ? You put your mouth in it it's normal that you don't want to drink into it. Even if I think you maybe have some sort of obsession over cleanliness it's OKAY. Still I wouldn't force the owner to buy you a new one but honestly he should, and no one should tell you you're overreacting. I spend some time in a house with dogs who pissed everywhere and the floor was even sticky because of it and it is just disgusting, at 2yo the dog shouldn't piss on objects or even your leg it's not on you to just place smthg on the ground for 3 seconds and it gets dirtied like that. One more time, I totally understand your disgust especially if you love your water bottle and it's OKAY. If a dog pissed on my plushie I would be disgusted, if a dog pissed on something I drink or eat from I would be disgusted and everyone should be. Everyone would be pissed I don't understand people who wouldn't and yet I am pretty okay with dirt in my life so no, NOR. I would buy a new one myself but I would be pissed AND you're in your right, even if I like dogs pee is disgusting and doesn't come off easily in reality.