First of all I would contact Canadian Tire and see if they will replace it under warranty. See if original purchaser will assist you in that. They may be able to go back in their records if they payed by Card or check and get a date.
If that doesn't work, I would try and patch it from the inside, because assuming our pools are somewhat similar (15' vs 18'), there should be two drain plugs on opposite sides of the pool.
As a last resort if you google "bulkhead fitting" and get one of these in 2" , then use a Threaded PVC plug to plug it off as Blacklisted has suggested. I say this is a last resort because it requires you to cut the liner to install this fitting. If this is your choice, have someone on the inside with a mixing bowl or bucket covering the cutout to keep from loosing any water.