As a test, I made some stakes out of ordinary clothes hanger wire. They are better than nothing, but they don't hold very good and they will get bent easily.
Standard titanium shepherd's stakes work the best for me on the soil that I run into here in California, so I normally carry about eight of them for my shelter. I also carry one SMC snow stake, the curved aluminum type, but it sees more use as a trowel.
You have to test your soil and then decide if you need something that you can simply push into the soil with your hands, or whether you need something massive enough that you will drive it in by pounding it with a rock.