It is hard for me to imagine that you got a large qty of water in the engine but I suppose it is possible.
In a perfect world, you would not drive the car until Monday.
As far as damage goes, in short run, I would not expect anything, esp if you do not run the engine hot etc.
If you did not change the oil and continued to run with water in there, one could speculate but why do so.
For peace of mind, get a new filter and some Mobil 1 in there on Monday and sleep peacefully.
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