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I went with Pentosin engine coolant. They have it (or can get it) at O'Reilly Auto Parts. $12.99 for 1.5 liters. It's been a year or two since I did mine, so I don't remember how many I had to buy. I think I bought 6 and ended up with an extra one, but that was many beers ago.
ETA: And don't skimp and use tap water. Distilled water doesn't cost that much.
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