Here, here. Don't use alcohol of any form unless you are specifically planning on going far below 0C. Distilled water + (water wetter || hyperlube || purple ice || goo of choice) = a good idea. If you don't want to spend the dough on an additive, THEN use a tablespoon or two of isopropanol per L of water. Even then, there will be no protection from galvanic corrosion.
Speaking of galvanic corrosion, just make sure that all parts of you WC system are of similar metals. That is the easiest way to limit/prevent it. All additives only work so much. It is easier to prevent the program before than after the fact. May I recommend all copper to you?
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