I used to cold crash 5 gallon batches in my side by side fridge and the shelves held up fine. Obviously every fridge is different, but I had no issues.
While I've never had to do this, you could use 20 grams of sucrose (table sugar) you have on hand which would be equivalent to the 22 grams of corn sugar needed. That's probably what I would do unless the LHBS is close by.
My buckets always smell like the previous batch and has had no ill effect. You might not want to scrub the buckets with a carboy brush though as any scratches left in the buckets can harbor bacteria. I just use oxiclean and a sponge to clean mine and that seems to do the job fine.