Okay, so this isn't a ground breaking DIY by any means but I had a hard time finding what parts I needed to do this so I'm gonna post in hopes others can save a little trouble.
This makes filling my small tanks so much easier and saves me using my hands or other implements to break the water flow.
5 gallon bucket... sturdier plastic the better.
1 ball valve (1/2" threaded)
1 Liquidtight One-Piece Fitting (electrical department, 1/2" thread)
1 plastic barbed adapter (5/8" hose; 1/2" thread)
Drill a hole on the side of the bucket near the bottom. Use a drill bit one size lower than thread part of the liquidtight fitting. I dont remember what size bit I used but it was small enough that I had to actually screw the liquidtight fitting in the bucket. I did this on purpose.
Also, you want to thread the fitting from the inside of the bucket so that the threaded side of the fitting is coming out of the bucket with the rubber gasket on the inside of the bucket.
Them, on the outside of the bucket I beaded some silicone where the bucket and fitting meet and also on one or two thread of the fitting as well. Then I tightened the fitting's bushing onto the fitting.
I beaded a little silicon on the last couple threads of the fitting and then attached the ball valve. The silicon probably wasn't needed but it was there, and I was there and the fumes made me do it.
Then I attached the barbed adapter (no silicon in this one, haha).
Attach the hose and you're good to go.