This might be a silly question, but I did not see any posts on the subject. If cans aren't allowed in the BW, how can I enjoy a good can of green beans (worth the weight). Should one simply repackage a can into a plastic bag and everything is okay? Would it spoil? What about leakage?

yes-you must repackage them into a reusable plastic container such as tupperware or the like. I would double protect it by enclosing the tupperware into a ziplock bag in case the seal on the tupperware breaks.

The only cans or glass allowed are those containing bug dope or medication. All other glass or cans are banned and subject to fines if caught bringing it in.

Another option is freeze dried green beans that can be purchased at outfitters or camping stores. Another option is to vacuum pack the green beans to bring them in.

I would think they would be good for up to a week unless it is unbearably hot. If you plan on going for longer than a week then bring freeze dried or go without.

Dehydrate them and/or freeze them in a plastic bag - either should work.

Not to be technical but canned fuel is also acceptable. I wonder if I could convince the ranger that a bottle of whisky is only for medicinal purposes????

Whiskey in Nalgene is not a problem-remember if you are going into Quetico with alcohol you are limited to 1.5 litre and it must be in a non glass container-so Nalgene or platypus are the containers of choice. If you bring alcohol into Canada through a Customs station (Pigeon River) and are going into Quetico from a Canadian entry (i.e. Beaverhouse) you need to leave it in its original conatiner and transfer it into plastic after you pass through customs and before you enter the park.

I tried putting green beans out of a can into a Ziploc. The spoiled after 2 days, and spilled despite being double bagged. This didn't work at all. I would not recommend taking anything from a can and putting it in a Ziploc.

Freeze dried sounds like it must be the way to go. What is freeze dried food? Is it purchased or made at home? Can I freeze dry anything? It sounds lighter at least. How's the taste?

Freeze drying is a type of dehydration. You can dehydrate at home with a dehydrator or oven, but it is cost prohibitive to do at home freeze drying.

A dehydrator can be purchased for about 30-50 dollars at Walmart, Fleet Farm etc. More commercial style dehydrators go for much more. Dehydrated green beans are easy and pretty good rehydrated. Lots of cook books for dehydrating and websites too. I do a fair amount of dehydrating for our trips.