We cycle through our water storage. We have about 5-10 gallons in reserve, and use a 5 gallon container for assorted things. Mostly for coffee/tea/cooking/drinking water over a week or two. The water in this area is hard and leaves a lot of scale, so filtered water in the coffee maker keeps it clean and tastes better. I drink the tap water but everyone else in my family hates the taste of it. When we empty out a 5gal, we start on the next and refill the empty, with another in reserve. The reserves may have to wait for a month to be used.
So for you:
Sell to the DS/conscience/wallet that you need another Jerrycan.
Use current jerrycan to fill liters.
Refill empty.
Now you have 12 gal storage, that you can work through your normal consumption without having at least 6 gal on hand.
Or,
Water your/friends/neighbors landscape.
_________________________
Jim
Do you know where your towel is?
Don't Panic!
I have an extra.