Cannot speak to California's drinking water but Arizona water is not all that great so you should have a water filtration system of some sort. Since it sounds like this may be a one time trip, I would look at getting one of the inexpensive RV in-line water filters. They will do an adequate job of doing two things, filtering out debris to protect your rigs plumbing and, offer some taste improvement, for OK to decent drinking water. If you want better drinking water and your rig does not have a carbon filter at the sink, you should look at a portable water filtration product such as one of the filter in a pitcher style systems which also can be kept in your refrigerator if there is room. We have a two stage canister filter system for water entering our rig, the first stage has a filter specifically to remove debris down to 1-micron and the second is a carbon for taste. Our rig also has a carbon filter at the kitchen sink and we have a Berkey water filter system we keep on a counter. We use the filtered water at our kitchen sink for cooking and the occasional drink of water if we forget to add water to our Berkey and our drinking water we get through the Berkey. The advantage to the Berkey in addition to providing excellent clear drinking water form an unknown tap, such as found at campgrounds, dump stations etc., is for boondocking where you can obtain water directly from pretty much any water source and obtain clear, safe drinking water, we love ours and would not be without it.
