For what you can buy a suitable RODI unit for and as easy and prtable if need be to setup as they are, the price is a small item in this hobby to have for peace of mind. Your gonna nbeed top off water or water to make salt water so face it, you need a rodi machine. It does not take long for the machine to pay itself off either......even if yur only paying 50 cents a gal at lfs, consider time, vehicle fuel and wear and tear......$120 will get you a unit delivered to your door and it can be up and in use within 30 minutes or less after receiving it.....