I have strictly used Distilled water for some time. Its $1 A GALLON at any super market. I have never had any problems with the water and I feed it about every three-four days at the rate of 3/4 gallon per 5 gallon bucket. I got into lab analysis a while back and sent some of my used soil to labs to test for micro life....To make a long story short its was very nice results and certianly better than tap water. Well water can be beneficial if you can get it. Tap water, even when set out can still contain chlorimine.
Peace, Love, and Happiness