I'm a total noob so forgive my ignorance. But what's wrong with buying already distilled water from the convenience store? Is it not as good? I can get a gallon for 50 cents. Honest question....that where I get my wort water
As Russ says, nothing's wrong with that. It's what I started out doing once I figured out my municipal water was not appropriate for the vast majority of brewing I planned to do.
I couldn't get my RO water as cheaply as yours; it was costing something on the order of $5-6/batch and even then I had to schlep that water home every time.
I paid, IIRC, somewhere in the $130-range for my system. That meant it would take 26 batches of using my own RO water for it to pay for itself. I just did batch 30 on that system yesterday.
I also have a TDS (total dissolved solids) meter to check the water to be sure the filter is still doing what it's supposed to do. I'm still at 6ppm TDS on it.
If i have any regrets, and it's not really one at one level, I wish I'd gotten a 100 gallon per day filter instead of the 50 gpd filter. I brewed yesterday, dumped my water in the kettle and started refilling the aquatainer for next time. It took just about 4 hours to fill 7 gallons, which is about right. The theoretical max for the filter is 50 gallons per day, or just over 2 gallons per hour, but that's under ideal circumstances yada yada yada. I'm getting about 1.75 gallons per hour which is well in line with what I expected. I kind of wish I'd bought the higher capacity filter but this one does what I wanted it to do.
BTW, I bought mine from Buckeye Hydro. I could have perhaps saved a little money getting an RO system elsewhere, but Russ helped me spec it out, and I considered that support to be the real value.