Mainly depends on the purpose of your drink, most of them should be health care, beauty, acne, and the effect of treating old constipation is good.
Generally, it is 100ML on an empty stomach in the morning and 100ML before going to bed at night, which is also an approximate amount. This thing is actually a medicinal and edible plant, similar to jujube and medlar.
Whether to add water depends on your tolerance, because it is really sour. You can also add a little honey.
This is really what I typed word by word, and it is also my personal experience.