Posting because someone asked about this. Purified water farming at sanctuary. You can go way past 999 water but you have to look in your pip boy (workshops tab) to see it.
Water - Horizon Wiki
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PSA: Purified Water from Settlements is one of the best income sources ingame. (Yield from one day) : r/fo4
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Fallout 4: Get Purified Water and Food for Farming
I found a very large water farm today : r/fo76
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