If you live in an area where it’s freezing cold and you have to wear gloves all the time, it will be near impossible to use your smartphone whether that be an Android or iPhone.
Of course, you can also make them rather easily using parts around the house.
The simplest capacitive stylus you can make is using a battery’s negative end. Just put some soft material on the negative end (so it won’t scratch the surface of your smartphone) and start using it.
You can also roll an anti-static film to make a capacitive stylus. I know most people have these laying around after buying computers/laptops, but I heard this method doesn’t work all that well.
Lastly, you can use snap fasteners to make a capacitive stylus also.