I've heard of people who have a little adapter to fill the little canisters from a big, re-fillable one. He would do them all the time for the Boy Scout troop, but I'm not sure how difficult it was to do as he usually did it before or after a campout.
2007 T-286SR Cherry/Granola, #6236, original owner, current mileage: 9473.8 (as of 6/18/21)
1997 T-2653 Blue Denim, #5471
1979 12 1/2' MC, Beige & Avocado, #4639
Past Sunlines: '97 T-2653 #5089, '94 T-2251, '86 T-1550, '94 T-2363, '98 T-270SR