Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you:
What do you decide to serve your guests? Cookies (く)! But not just any cookies. Cookie smoothies! They're delicious and you won't pour anyone anything else. They must drink your delicious cookie drinks.
Please pour water into this bucket quickly.