What must be done with water to turn it into steam?

If you want to do it yourself, then just heat the water to its boiling point, that is, up to 100 ° C (Unless, of course, you are in the mountains, because in the mountains, the boiling point of water, due to low atmospheric pressure, is about 50 -60 °).
Well, there is another way. Just put a glass of water on the table and do nothing, the water itself will begin to evaporate, but it will only take more time than just bringing the liquid to its boiling point.