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The Spirit Anglers realized that, although water can be conjured from thin air through magic, some adventurers are more connected to the physical world. Water isn't stored in this pump, nor is it routed through the pump. The pump simply calls upon the same source of magic that you also do when casting a water strike, or humidifying buckets of water. Not all of us are so in touch with magic, and so we have a pump. The runes that power the pump are re-stocked by the Spirit Anglers between rounds at Tempoross Cove.
That'll be $11.
Can we buff Tempoross drop table to give fat stacks of water runes to make this explanation fit the meta?
Why? The Spirit Anglers are just letting you fish up junk that washes up on the seaside. They wouldn't want to share their precious supplies with you.