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.
How to get Purified Water in Fallout 76 | Shacknews
Fallout 76 | How to Get Purified Water - Guide & Tips - GameWith
Fallout 76 | How to Get Purified Water - Guide & Tips - GameWith
XB1] H: UNY/1int/junk-20% left leg W: Bloodied or vamps commando offers : r/Fallout76Marketplace
How to get Purified Water in Fallout 76 | Shacknews
Fallout 76 Water Purifier New Player Guide | Plans Location and Setup Info - YouTube
How to get Purified Water in Fallout 76 | Shacknews
Water purifier (Fallout 76) | Fallout Wiki | Fandom