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RODI should be used for all water in the marine tank from first filling, to evaporation top off to pwc's. If you don't have a RODI unt try to get some from a lfs, a local grocery, WalMart, etc.
+1 for Cmor's advice. If you don't have the cash for an RO/DI unit, go to your local Walmart and get some of the 5 gallon Culligan jugs and fill them up at the RO station they have there (Big blue thing).