Me and 6 or 7 friends are going on a camping trip in Algonquin (Ontario) near the end of July. We plan to go along this trail
http://www.algonquinpark.on.ca/visit/camping/eastern-pines-backpacking-trail.php
and should be staying for four nights.
This is what we are planning on bringing right now:

-Tents
-Sleeping bags
-sunscreen
-Bug spray
-Normal backpacks (school sized bags)
-I have hiking boots (they should be getting some soon too)
-matches/lighters
-a radio
-flashlights
-whistle
-map
-Iodine (for water purification)

Any suggestions on things other than what is listed that we should bring? Anything on the list that we don't need? What kind of food should we bring (we plan to fish when we get the chance but I doubt that we can catch enough to feed us all)?