This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. Just remember that 一 becomes いっ, and 杯 becomes ぱい.
"Let’s go for a drink." "Sounds like a plan."
When I was a child, I watched a movie called "One Cup of Soba Noodles in Broth" just once.
My mind was so full of the following year's budget that I didn't feel like having even one drink that night.