Built this today, as I just started 5 gal batches (from 2 gallon MrBeer) and the Brita pitcher isn't going to keep up. Thanks to the OP for listing parts, as those were a good starting point, as old as that post is i wasn't surprised that some parts were missing.
Here's what I ended up using that was different :
Filter -> Used Whirlpool WHKF-DB2 (.5 micron filter), was $28.86. I could only find 2 micron filters that did not list "lead" as one of the things it removed. I checked Lowes, home depot, and Walmart... this was the cheapest filter that list lead,chlorine, and sediment. *found these on the back wall of section that has sinks, toilet stuff, and sump pumps
I also used different parts for the output, i took the housing out and wondered the PVC section. Nobody seemed to mind. I found a 3/4" threaded to 1/2" threaded adapter, then a 1/2" threaded to 1/2 slip adapter and 1/2" elbow. These parts were under $3 total, and with the flow rate needing to be backed down to 1 gal per minute i didn't see the need to use 3/4", and i had plenty of 1/2" pvc at the house. * the brass male-to-male fitting was over by the toilet plumbing stuff, against a wall where parts were on a board showing what's in the bags. The PVC parts were over by the sprinkler systems.
Lasco Brass Adapter (coupler) 3/4 female to 3/4 female "swivel" part 15-1705, got this from local ACE hardware store when I realized I forgot a female-to-female adapter on way home. This one did not leak, in case the poster that had issue with that. * by garden hose section
Apex 25" drinking water safe hose from Walmart, only place that had a hose shorter than 50" that I visited today. Found this by the BBQ equip $14, list "built-in protection guards against mold, mildew and bacteria on inside of hose". That hopefully will help with me storing this in the garage. I plan to have this entire attachment with my brew equipment, only used when i brew. I'll hook the hose up, and use it to wash/clean items... then hook the filter up with the Quick Disco to get water to be used in brewing.
Also, anyone else with a "leak" issue should try using some plumbers tape on the fittings, it will work if the leak is out the threads.
And finally, anyone worried about brackets... i just made a small section of PVC pipe (3") out the elbow and hang the filter off the brew kettle by the elbow (filter housing on outside). The setup seems very stable.