Well, the reason something like DI water or referse osmosis is recommended is because it gets out a lot of the small particles in water that can clog your nozzles. And supposedly something like DI water is healthier for you, although I still have to be convinced. So as long as you think your tap water is drinkable, go ahead a use it if you want. There are ways to get nozzles unclogged, like using vinegar, so there are remedies if anything happens. Or worst case senario you have to order a new nozzle.