A 50%/50% mixture should work just make sure you always use distilled water, otherwise trace minerals may be left behind and end up clogging things up.
If your really worried about it simply using100% distilled water should do the trick as well. Your just going to have to refill it more often.
Can you find a picture of the regulator? Does it look anything like: http://www.bealltool.com/nphum.htm?Edited by: hex1848
Imagination will often carry us to worlds that never were. But without it we go nowhere. -- Carl Sagan
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