I use normal water but put in vinegar small bottle to keep the water lines from clogging.
I also sent my complaint to Toyota Indus and my Toyota Service provider who promptly sent me an email and got a call from my Service Centre, the part was replaced today. I was advised to use a small quantity of liquid detergent in the water mixture to prevent future clogging.
Will try that, lets see how long this works. Frankly I use the windshield washer/wiper quite frequently and using distilled water for Windshield Washing seems to an expensive proposition, but seems like a reality. There really has to be a simpler cheaper way to manage this.