i use a water conditioner, I will still get some distilled next time thoYou would be better off getting a gallon jug of distilled water from the grocery store/Walmart for mixing until you get Rodi. Or even those large 5g blue distilled water jugs you can refill.
Any types of things in your water can impact your aquarium. The types of metals/solids/chlorine/etc. in your tap water will vary from city to city. Some are worse than others, but at a minimum, can cause/fuel algae and bacterial blooms.