Go to Islington subway, get a Mississauga TTC map, find out how to take Go transit, Mississauga TTC etc. if you find the right route, 1.5 - 2 hours one way.
2. Car Pool
Go to Kipling subway, write the following on a piece of paper "carpool wanted to highway 10 & 401, 8AM, back 5PM", wait 20 min around passenger waiting zone just outside subway gate.