Just rotate your stock!
You can easily get 30 days without adding anything to the fuel.
IMO…Stay away from Stabul and take a look at PRI-G, it will keep (or rejuvenate) your gas for years. Check out the real world testing done by users, not that the company is biased. This is not “snake oil” it works. I had gas from the end of 1999 (remember Y2K?) that was stored in 55 gallon drums that I finished using in my mowers, chain saws and log splitter in 2012. It flat out works when stored in a metal can as the can will not permeate O2.
Now… back to the cans. These are great cans at a most excellent price BUT the paint will for sure come off the bottom edge. Fear not, they will not rust as the can is galvanized coated. The other big complaint I read with these cans is, they are heavy (they do hold five gallons so they will weigh in at about 35 pounds when full), you may need another funnel and it may be hard for some to get the last drops out of the can when pouring into a car and may be somewhat hard to use the handle/sealing mechanism for some people until they get used to them as they are safety cans and need to be designed the way they are for real world reasons.
I was in on these cans many times at the $29.00 price point they were previously sold at on Woot, so this was a no brainer at $20.00!
Over at The Mother Ship:
http://www.amazon.com/Eagle-UI-50-FS-Gasoline-Type-I-5-Gal/dp/B00GVJAXZQ