You can make this powder at home, but first, you need to choose the right ginger root. You should be able to cleanly snap an organic ginger root without a lot of fibers being left in between. This will make it easier to turn raw ginger into its powdered form.
You can use this to make ginger tea. You can also use it as a spice while baking. However, it is quite potent and so, make sure you use it sparingly.