Wow. Rainwater? Really? Wasted $750 by not spending $10 or less. You also could have just not fed and waited the two days it apparently would take you to find $10. You also could have asked a friend for some dechlorinator. Obviously many more options than rainwater...
sorry for the loss,
should of waited for the prime buddy, or at least tested the water before using it.
Well thanks for sharing so at least others may learn from this.