It's best to use a coffee pot. The small capacity is only a few tens of dollars. Three teaspoons of coffee powder can make three small cups of coffee. My coffee pot was bought from Tmall and it works well.

If you don't have a coffee pot, you can also use filter paper. Make the filter paper into a funnel shape, put a colander for kitchen under it, put the filter paper and colander on the cup, put 2 spoons of coffee powder in the filter paper, slowly drop the coffee powder into it, add some crystal sugar to the coffee that falls in the cup, and then pour it out together with the coffee grounds. I did, but it was a little troublesome, so I bought a coffee pot later. I hope it works for you.