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The distilled water part may be going a little overboard, but aside from that, I'd do the same thing. Depending on your local water supply, using pure, (or more pure) water might be a good idea. Most people don't worry about it. Typical antifreeze works best when mixed 50/50. Both too rich and too lean will both raise your freezing point and lower your boiling point. There may be some strange antifreeze that works best with a different ratio, but I'm not aware of any.
Normally, I pre-mix all my coolant. I fill my old antifreeze jugs half-full with water, then top it off with antifreeze. Then I fill the rest of the (half-full) antifreeze jug with water. (Then I label them "pre-mix" so I can tell them apart!)
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