I have a 5 gallon gas can with 4 gallons of 100% pure methanol (from innovative tuning this summer) and a 2 gallon gas can that I cut it 50/50 in and use in my car. I sold the car, and no longer need this. Its like $40 worth of stuff, I will take $20.
So for 20 bucks, you get a 5 gallon container, a 2 gallon container, and 4 gallons of meth!
If you keep it in the garage for the winter months, it will still be good once spring arrives. Don’t know if you’re worried about it freezing, but, if you are - it won’t.
If the container stays tightly sealed then it should be fine. If the container changes in size like it sucks the side in dont open it just leave it. Also keep out of direct sunlight.