Might be confusing oil with coolant. OAT does stain and looks similar to oil. If you're water pump has failed as sudenly as you've explained, it usually means internal pressure (bad) has popped the bearing. Which may explain were the coolant went to begin with. If that's the case the water you put in will come out of the pump and be easy to see without pressure. Only no this from experience, I replaced a pump, trying to eliminate leaks one by one and the new one let go in a matter of weeks.
Get it checked by an experienced landy mechanic, not only will they fix but do the neccesary mods to stop it happening again.

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