I am going to build myself an auto top off for my tank, I got the container for the water, I see on here where evryone plumbs with John Guest fitting, and r/o tubing. Where can you get these John Guest fittings and the 1/4" r/o tubing? Is this something that is available at Lowes or Menards? Would I just ask for John guest fitting or do they go by something else at the hardware store?