this from the park website - toward the bottom is caching - says canoes or equipment, but nothing about food????  I'd call the park office to be sure.

"Quetico is a specially managed Wilderness Park

The protection of Quetico Provincial Park is guided by rules and regulations that backcountry campers must adhere to. While this is not a comprehensive list, the following are a few notable rules to follow.
•Can and Bottle Ban: Non-burnable, disposable food and beverage containers are not allowed. Fuel, insect repellent, medicine, personal toiletry (non-food & beverage) containers are permitted only.  Please carry out all fuel cans
•Mechanized Use: It is illegal to possess a motorized boat, power saw, gasoline generator or power ice auger in the park.  No person may use a mechanized portage device, all terrain vehicle, snowmobile or similar mechanized equipment in Quetico Provincial Park.
•Party Size:  Nine people is the maximum party size allowed on a campsite.  It is recommended that large parties (any group over 5 people) travel separately across lakes and portages.
•Fishing:  Ontario fishing regulations require the use of artificial bait and barbless hooks within Quetico Provincial Park. Live or dead organic bait is not permitted in the park. Examples include leeches, worms and salted minnows. Live and dead bait can introduce invasive aquatic species. Barbed hooks may be pinched to conform to regulation. Reduce fish mortality by using barbless hooks, keep fish handling to a minimum, use proper fish handling techniques, and be aware of fishing regulations.. A valid Ontario fishing licence is required for fishing and must be in your possession. Licences are not available at all park stations and should be purchased prior to your arrival at (You need to Login or Register to view media files and links)
•Pets:  Pets must be leashed while visiting the park. Non-residents must be able to provide a current vaccination certificate.  Please remember to pick up after your pet.
•Firearms:  Possession of a firearm, including a rifle, shotgun, handgun, air gun, pellet gun, paintball gun, slingshot, bow or crossbow is prohibited. Hunting, molesting and harassing wildlife is also prohibited.
•Canoe/Kayaks:  Canadian Boating Safety regulations require: ◦One lifejacket or personal flotation device (PFD) of appropriate size for each person on board
◦One buoyant heaving line no less than 15 m (49’3”) in length
◦One manual propelling device (i.e. set of oars or paddle) or an anchor with no less than 15 m (49’3”) of cable, rope or chain in any combination
◦One bailer or one manual water pump fitted with or accompanied by sufficient hose
◦Sound-signalling device (whistle)
◦Watertight flashlight if paddling at night (Batteries must work)

Please check current boating requirements to ensure regulations are met at (You need to Login or Register to view media files and links)

•Litter: Pack out all non-burnable garbage, including tinfoil. You may not leave any litter in a provincial park, except in a place designated for that purpose.  Likewise, you must keep your interior campsite clean and sanitary at all times.  This will help prevent problems with bears and will also help to preserve Quetico’s wilderness.
•Closed Campsites: You may not camp on sites that are closed to camping.  Obey no camping signs.
•Quota System:  You must enter Quetico during business hours through the ranger station, on the entry date and entry point designated on your permit.  Do not take unnecessary risks, late arrivals due to high winds will be accommodated.
•Vegetation:  It is unlawful to remove, cut or damage any vegetation. For fuel wood, use only fallen dead wood collected from the shoreline and far from your campsite.
•Historical Sites: Quetico has a number of important archaeological sites within its boundaries.  You may not remove, damage or deface any relic, artifact or natural object or any site of archaeological or historical interest.  You may not disturb these sites, make an excavation for any purpose, or conduct research without written permission from Ontario Parks.
•Pictographs: Leave archaelogical, historical and pictograph sites untouched.  The Pictographs in Quetico are spiritually sacred for Anishinabe People.  Approach all pictographs queitly and respectfully. It is illegal to deface these sites or remove objects such as bones, arrowheads, and other artefacts. Quetico’s pictographs are fading. Do not touch the pictographs: Oil and perspiration can accelerate the deterioration of the pigment.
•Campfires:  Use existing fire rings. Fire pits must be built on bare rock or bare mineral soil and kept 1.5-3m from vegetation including overhanging trees.  If windy, do not have campfires.  Make sure your fire is out.  Fires are prohibited in a restricted fire zone. Possession or ignition of fireworks in a provincial park is illegal.
•Equipment Caching:  It is unlawful to store or leave unattended any watercraft or equipment in the park without the permission of the park superintendent.
•Campsite Structures:  Do not build tables, chairs or other structures at your campsite. Please leave the campsite as you found it, taking all your gear with you, including fire grills and grates.
•Noise:  Enhance your own experience and the experience of others by keeping noise to a minimum. We also encourage all aircraft to fly 4000 ft. above sea level when possible to help reduce noise levels."

I believe the cache restriction is intended to apply while you do not have a valid permit, otherwise you couldn't day trip and leave things in camp, but I'll try to ask the superintendent at Canoecopia. Just a little more than 24 hours!

It would be ok with me if they discounted the daily rate for each day over 15 consecutive. 50% seems reasonable.
This show is packed today. Time to escape and see some presentations....