I like the bridge/plugged conduit idea but initially I thought that what Cora did was to make the last tiny drop, stuck in another shell perhaps, multiply itself into a lake. Changing the size of something is associated in a way with Wonderland (small drop to big lake maybe?). I don’t think she could open portals so easily even to call the lake back from other mystical waters.
Does that mean the Siren comes back too?
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“If I had a world of my own, everything would be nonsense. Nothing would be what it is, because everything would be what it isn't. And contrary wise, what is, it wouldn't be. And what it wouldn't be, it would. You see?” -- Lewis Carroll, Alice's Adventures in Wonderland & Through the Looking-Glass