whether it is 117 or 114,118, coffee itself is a little sour, and ucc series is not very sour. The key is that bottles are difficult to keep, and it is normal that they will turn sour if they are accidentally wet. My bottle of 111G118 will get damp if it is left in the dormitory for less than 2 weeks. There is nothing I can do. You can pay a single package (other brands, ucc does not have a single package), which is very expensive. Or buy a vial. As long as you are in a humid area, it is inevitable that you will get wet and turn sour. If conditions permit, it will be much better to put it in lock lock. In addition, the spoon used every time must be absolutely dry. If you get wet, add more milk and coffee at the same time. There will be more milk and less sour taste.