Keith, no need to make individual post to the various responses especially when they are ther same. You can reply to any and all posters in the one post.
I hope Jiffy lube are correct in their statement that the coolant will not cause any solidification/Jellyfiying of any coolant that remained in the system.
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Regulations specify mixability of liquids, Keith, originally required by the military - you’ll be all right…
However, take time to check for leaks before doing anything more…
Frank
xj6 85 Sov Europe (UK/NZ)
Tap water not te best. Dependent on area, it can be very heavily mineral laden to only somewhat. use distilled water.