losing coolant

I had a car years ago that had the same problem you had....losing a little water but couldn't see any wetness anywhere....racked my brains and time for days trying to figure it out.....Turned out there was a tiny pinhole in one of the hoses spraying a fine spray stream of water (could hardly see it)

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Exactly the same (wifes late model ford) had even redone the head thinking it was a porous head spent nearly 12 months before finding it by chance one day after a long run had to refill the washer bottle as it ran out on the drive got home popped the hood and saw the fine spray coming out of a heater hose was hitting the block and evaporating straight away,