Living in the desert means I carry water in practically every container possible.

I always have, at a minimum, a small pilots flask. About 500ml. Being flat, it fits easily in my pocket or bag. Good for about one good drink. Only use this when I am within easy "refill" range. Oh, all the plastic containers I mention here are food grade.

Nearby I keep several plastic GI canteens. One quart, kidney shaped standard item. Cheap, usually under $2. I have a bunch of them. Still small enough to easily carry. Usually have two on my molle vest. In my bag, I have one pocket with the standard GI cup. Stainless steel, heavy but indestructible. Been carrying the same one for many years. Doubles as a shovel, pot, parts holder and numerous other uses. It makes a good "place holder" for the canteen. Easy to replace the canteen in the bag. Snapped to the bottom of the cup is the standard GI canteen stove. Small gel pack of fuel is elsewhere in bag.

Also have several larger military containers. They hold about 3/4 gallon. Very rugged plastic. 4 of these are strapped into the truck. I rotate the water occasionally, but they are for emergency use only. They can be carried in a pack if needed and are rugged enough to bet my life on.

I removed the back seat from the truck/camper and keep 4, 3 gallon (standard blue cube type) water jugs. 3 gallons is a manageable size.

I seldom use hydration bladders. Had one leak and lost my water supply. I had the foresight to also carry one GI canteen and my partners shared their water supply so no harm done. But I no longer put all my water in one container.

The truck camper has a 30 gallon fresh water tank. All of the above are filled and checked prior to every trip.

Camper has several water purification systems as well.

Many years ago I ran out of water. Had a very very bad day. Could have been worse though. Kinda had an effect on my water storage habits.

Nomad