No, we won’t run out of it, but it could become more expensive, especially locally. Areas with the water issues you keep hearing about are really just struggling to provide the quantity of water they need at the price they want. Specifically, they typically get their water from local ground water and then purify it. Typical costs of this are in the range of pennies per cubic meter of water ($0.05-$0.25/m^3).
Meanwhile we can turn seawater into drinking water for something like $1/m^3 (and we can basically get unlimited amounts of drinking water at this price).
The issue with the places with water issues is their people are paying maybe $300/yr for water, and the government is saying if people keep this up we’ll have to switch to other sources and your water bill will be $1k/yr or more.
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