Correct

苦水

/ kǔshuǐ / 
Strokes

Definition

bitter water (e.g. mineral water containing sulfates)/suffering/digestive fluids rising from stomach to the mouth/fig. bitter complaint

Example

As a Noun

hard, bitter water

1
Kǔshuǐ
苦水
jǐng
井

bitter water well

2
Kǔshuǐ
苦水
hú
湖

bitter lake

As a Noun

bile, gastric secretion, etc rising to the mouth

As a Noun

suffering; bitterness