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The most misunderstood prepper supplies that most non-experienced people seem to forget is water supply.
We have come to expect the water to be there whenever we turn on the faucet or tap.
Ever try to cook rice, pasta, oatmeal, sauce ,etc. without water ?
Of Course you can substitute for water, ..it can be done, but at the expense of more costly and expensive supplies.
Know your water source, and where it comes from, and how it gets to you.

If you have a pressurized water pipeline, what is the line made of (ie.: lead, cast iron, pvc, etc.).
Even if you are on a spring or a free stone creek, how close to the source are you ?
Do you know what is upstream from the source ? (ie farmland, chemical plant, hazmat storage site, waste treatment plant, aquaculture or hydroponic grower, etc. ?)
All these, and others, could affect the quality of water that you may have come to rely on, and expect.
Any changes upstream may affect the hydrology of the supply area.

It is not unreasonable that when you move to a new location, that you have the water quality tested.
I used to think that buying bottled water is a needless expense, right ?
However, if you are prone to kidney stones, allergies, or high blood pressure, it would be wise to have your water tested
for sodium, mineral deposits, algae, insecticides, agricultural chemicals,and/or for even pipeline leeching possible contaminants.

My point : Don't take your water supply for granted, as most of us do. Even experienced preppers do it, too.
The prepper "rule of three's" still applies.