So I have found myself looking at getting a fish for my child and am thinking he would like a betta. Since we can easily get a small tank for his room which a Betta would thrive in and the attitude of "I keep a reef, I should have no difficulty with a betta" we figure this would be best. Turns out FW information is not as abundant as SW. Or at least that i could find. So my main question is, since I am only finding that distilled water is not good for Bettas and also that well water has the potential to kill fish if certain things are in the water, if my options are rodi or fresh from my possibly contaminated ground, which water source should i go with? As a side note, I am not willing to try to find someone to test my well water or pay for it to be done. This is why I use RODI, so I don't have to care what is in my well water.