Well I love my tap water. I refilled a bottle of it (yes it's true) 26 times in one day when I was sick and drank it all and kept drinking it. It's great! I doubt it would gain 80 PPM through the tubes... along the way. I'd guess it'd be 50 PPM. And I make little money so it's hard to afford these things, that's why I can't afford it for a week then it's SFRSS (Standard Flat Rate Shipping Service) so it would take another week.
TBH, I can't afford even one gallon of distilled water, so I'm staying with tap water until I see them start to decline or nothing changes then I'll keep sticking with it. I doubt that it would gain like 80 PPM through the tubes. Would de-humidifier water work too?