If i were to boil water and let it cool, and then heat it to the right temp/add salt to it/ and get the ph right would this purify the water and make it ready for my tank?
I'm not a chemist or water purity expert but boiling water will still not get all of the metals and other undesirable elements out of the water. Water is the one thing that you shouldn't try to go cheap with. Just go buy some RO/DI, distilled or even Glacier water (in the little vending machine) which is sold at most Walmarts, Randalls and Safeways.