Basic economics, Lucy. Higher price will generate more supply and/or encourage conservation. The current prices, especially for agricultural water, are artificially low, which is encouraging waste.
(I have some doubts how much more "production" could be reasonably generated, and we do need to watch out for drawing down fossil water that isn't being replaced as fast as we use it already.)
They were not, at least according to Reuters, talking about making agriculture and industry pay the real cost of water, which is a whole other thing. They were talking about raising the price of drinking water, as the primary method of dealing with the global water shortage.
If you mean in the article you linked (which is from Reuters, so I'm tentatively thinking that's what you mean), I don't see anything limiting it to "drinking water", nor do I see any indication that they think it's the primary means. It's what that one press release addressed, so it's what the article is about, is what it looks like to me.
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(I have some doubts how much more "production" could be reasonably generated, and we do need to watch out for drawing down fossil water that isn't being replaced as fast as we use it already.)
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