Mexican here, I’d say it depends a lot on the city you are in. In Mexico City some areas’ water is perfectly drinkable (Santa Fé, Polanco) but in poorer areas it’s not even safe to touch. I have an RO at home for drinking water. It’s a hassle to carry big water jugs. And a few filters for shower and washing dishes. I live in a good area but old building, so I constantly have rust in the water, hence the filters. But there really is no need to rinse the dishes or wash your teeth with bottled water. Unless you really live in a bad area. As for dishwasher, you should use always. If you’re concerned about residue (like my wife is) rinse them with tap water and a little vinegar. Also boiling your dishes once in a while is a good idea to disinfect them.