Water?

Most if not all of regions in Mexico sell the water in garafons, about 5 gallons each. They're inexpensive, and you will trade the empty ones you have for the ones you pay for and receive; they will come with caps of course, mostly soft plastic ones you peel off a lower segment, to use. I have found two sizes of necks on the garafons, the smaller ones had rigid, screw down caps. For these one needs a different size garafon, than the slightly larger, first type.

For the years we traveled to the mainland, we always relied on the 5 gallon bottles, called garafons. This water is called purified water - to what extent it is, may always be a mystery. But personally, we were never sick traveling in Mexico. In a boondocking, beach situation, for two people, we would use three or four garafons per day. One would be set out in the sun near the shower tent, warmed by the sun until after we did our snorkle around the coral for about an hour, and by then the shower water (pumped by the spare 12 volt water pump) would be wonderful, one-half the bottle each.

We would do all our cooking outside, where another garafon provided this kitchen with water, also used during the early morning, for brewing coffee. A third bottle resided inside our motor home. These last two would be equiped with an inexpensive Mexican made hand pump, available in many stores for about 3 or 4 dollars. Quite often a truck will deliver to an area with several RV's present. Buying these will give you reliable drinking water and it certainly is not unheard of to fill your rig's water tank with this source, or likely a better idea, fill it partially, as you wouldn't want the water to sit in the tank for too long.

But all the time we traveled, we'd "try" to keep the water tank as sanitary as possible, but in reality we never use the tank for drinking purposes. Brushing teeth, washing up, and even showers yes, but never for drinking, making coffee, or cleaning fruits and vegetables. Many make it a hobby to treat the water that enters their water tank although we never did and these days, wintering mostly in south western USA, we still do the same, carrying one garafon,filling it from machines near grocery stores, and a 15 gallon plastic tank that we use to carry water with our towed car from other, even cheaper sources, back to the rig (using the same pump for the transfer into the big tank).

Bottle water for coffee and rinsing the vegetables and fruit after washing with soap, otherwise I drink beer.

Oxxo sells bottled water and wife likes the Penafiel naranjada, it is not bad mineral water with orange flavor.

navegator

The problem with tap water is all the tanks & cisterns that are cross connected. When city water fails (and it does) the content of the tanks flow back into the city water system. It will take years and lots of money to fix that issue. For what little water you'll ingest it's not that expensive or difficult to use bottled water.
Folks will tell you that you can filter or treat the water, and maybe you can and get away with it. But for me I'd rather be safe than save a couple of dollars.

yea bottled water is cheap and available everywhere. Look ofr ones with screw top caps, Ciel is the most common brand. With that one you wont be transfering water over as much.

I use bottled water for potable needs.

Water pitchers fail to remove heavy metals. Groundwater supplies in mining areas often have lead, arsenic, and even trace amounts of mercury. The day any Brita can make briny tap water taste good for coffee, is the day I will fall over.

The store where I am connected, has ten or so Brita pitchers. Locals (Mexicanos) do not trust them and all ten have been sitting on the shelf since they arrived.

Rural water systems often loose pressure to leaks or to pumping shutdowns accidental or intentional. In many cases you do not want to know what leaks back into an empty water pipe.

Some cities have purified water supplies. Me? I carry a Total Dissolved Solids measurement pen. Reverse Osmosis plants have been known to pass less than 100% sanitized water.

Many areas have so many minerals in the water supply it raises the devil with hot water heater anodes. I've seen folks dumping 19-liter purified water garrafones directly into their rig's water tanks. Chlorine purification cannot see a reverse osmosis membrane so count on city water being untouched well water.