Thanks man! I agree.
I just use tap water, but she have a very large heavy glass bowl. When I observer her, every single time I change the water, she likes to slither over the top of the bowl, and 'dip' part of her neck in it, then she drinks. By the end of the day, its a little cloudy. My water comes from the municpal water supply - who knows what's in it.
Roddie is in excellent health, so I guess I'll just continue to moniter and tweak as needed.
Thanks Everyone!
HHH