Water

Charcoal filters, like Brita, or other pitchers/faucet attachments.

try this out man $18.00 at wal mart

DIY Reverse Osmosis - For Scale Grower - Cheap, Portable, & Effective - International Cannagraphic Magazine Forums

I didnt convert mine, I just use it straight up and it works great.

Not sure how much longer this product will last though... its terrible at washing cars but great for my plants! LOL

just lt sit for a day i think the only time u need pure water is when you flush other then that you are wasting money check out my gro leave comment