Ditch the distilled and R/O there are no minerals in it. Most folks use treated tap water. I personally use fresh caught rain water. I'm not in the city or near fields so chemical pollution isn't a concern of mine. Other use bottled spring water. If I didn't have the rain water my 2nd choice would be the treated tap water since when buying bottled water you're not sure of the water source. IMO. Zoo Med makes a product called Reptisafe. That's what someone recommended to me for the forum.