The easiest way to drink specialty coffee is the adjustment of hot water. Pour about 150㏄ of 15g of powder as the first guide, and add hot water if it is thick after drip. Add about 10㏄ at a time and find the taste just right for yourself. Why don't you find the balance between the amount of powder and hot water from there?
The taste tastes are different, so I look forward to the recommendations of cafes and manufacturers, but the best way to find a taste that fits yourself is to start with concentration adjustment.