Number + 杯 + Noun
杯 (bēi) is a measure word (classifier) used for drinks served in cups or glasses. It is required when counting beverages in Chinese, appearing between a number or determiner and the noun, as in 一杯茶 (yì bēi chá, "a cup of tea").
我每天早上都喝一杯咖啡。
Wǒ měitiān zǎoshang dōu hē yì bēi kāfēi.
I drink a cup of coffee every morning.
请给我来两杯热茶。
Qǐng gěi wǒ lái liǎng bēi rè chá.
Please bring me two cups of hot tea.
她一口气喝了三杯水。
Tā yìkǒuqì hē le sān bēi shuǐ.
She drank three glasses of water in one go.