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You covered it.

I would NOT attempt a drive without refilling the system. I too would use distilled water until I found and corrected the leak.

If you don’t refill, the low coolant sensor can and probably will shut you down or at lease derate the engine.

For sure low on coolant as i could not feel any coolant at neck of filler and when you turn the key on I get a low coolant error and a very low coolant error.  If you can see from one of these images where we had coolant all the way over at these lines near the engine and had coolant actually running down the side of the muffler.  That is where it actually made it to and was running onto the ground just on that side of the engine between there and the muffler.  

Thoughts right now are to fill with distilled water to see just how much I lost and thenI guess the debate is am I safe to drive on Monday?  I don't think I'll get it to leak if I'm just up to 185 or so since it stopped leaking last night once temp came down.  Or I guess hypothetically could I have lost enough coolant to be below the leak now?  Seemed like it was more temp related.  I apologize for my ignorance if that would not be a thing on being below where the leak would be.  

Also included a pic of the bottom or radiator