It's said Chinese wolfberry tea is a good tonic, about the portion ratio of how to make tea, according to what I looked up, about 15-20 for every 500ml water.

It's said it should soak in hot water for 10-15mins, and can be made for 3-5 times.

So 15-20 is enough for a day, and drink about 1.5-2 liters of the tea.