The Lord can't do this, Cino? Being Spirit?
If the water were Spirit, if you filled a cup from a larger aquarium, and remove the cup,
it is all Spirit, both in the aquarium and in the cup.
Depends on what you mean by "one". Indivisible? Unique? One-of-a-kind? "There can be only one"? Nothing-but?
Does your understanding of divine Oneness allow for god-free zones? Would they not constitute an other, a second, a duality?
In your water/spirit analogy, what would happen if you divided the water into two equal halves? which one would be the "original one"?
Edit: I'm interested in your views on these questions. I am not challenging your belief in the One.