So, I've got a 50gpd RO system plumbed in my basement. It feeds the icemaker, drinking water faucet and a spigot behind my aquarium. Problem is, a PWC on my tank takes a day and a half to refill using the RO...even if it runs non-stop...and I can't let it run non-stop or my wife can't make her coffee in the even and morning. What I would like to do is have a resevoir of RO water that is around 50 gallons, so I can do PWCs with impunity. Catch is, I'm broke. How to accomplish this on the cheap? My first thought was a largish bladder tank, but that turns out to be cost prohibitive. OK, so how about an improvised atmospheric tank made of a Brute trash barrel? Cost is right. But how do I control it? I've got no issue putting a level control on the barrel to keep it full, but how do I provide pressurized water from it to the various outlets on the floor above? Adding a pump and small bladder is going to be just as expensive as adding a single large bladder, so that's out. Is the bladder even necessary? Perhaps a small jet pump or transfer pump, check valve, and a pressure switch set to around 20 psi? Are typical (cheap) pumps going to be OK with RO water (I'm guessing not)? Thoughts?