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If you find yourself without any professionally-made de-icers handy, go with rubbing alcohol, which is arguably the most effective substitute (and risk-free as far as damaging your car goes). Mix one part water with two parts alcohol, fill a spray bottle with that, and use it just like you would with a store-bought spray can. If you’re really in a pinch, you can also mix the same ratio of water with hard liquor instead. Once you get the ice off, try to remove as much of your homemade solution as possible. Start your car and give your windshield a squirt of wiper fluid. Then run the wipers to remove both that and the solution so it doesn’t linger and potentially ruin the glass.
Make an alcohol solution. Run your wipers afterward.