I did a similar thing in my Mystique, however it was a 5 gallon bottle of water that tipped over during a turn! I took the door panel off and repaired it with Alymers resin ( two part resin glue~ dries like plastic, with a yellowish colour) keeping the adhesive at the back. Use electricians tape to keep the shape of the panel and prevent adhesive coming through.
It's not like a new panel, but a lot cheaper!
Also, next time, fold the seat down and use all of the trunk too!