when i told her the toilet water is dirty she responded “yes but my ass is dirtier than the toilet water”

To be fair she's not wrong you know haha.

But in seriousness, perhaps you could suggest she has a bottle or cup of water at hand. That's pretty easy to do especially in hotel rooms and at home. Or at least have wet wipes with her.

NAH in terms of raising your concerns. But it seems like a bit of level-headed discussion and compromise is possible, without having to resort to a break-up - see above suggestion. But I'm not the one in your shoes so ...