This is the 13467th most frequent Russian word.
напитка
"Напитка" is a declension of "напиток," meaning "beverage" or "drink" in English.
In this sentence, 'напитка' is in its genitive singular form showing possession or association with 'горячего' ('hot').
Я возьму чашку горячего напитка.
I will have a cup of hot beverage.
Here, 'напитков' is in the genitive plural form, used after 'множество' ('many').
На вечеринке было множество разных напитков.
There were many different drinks at the party.
In this instance, 'напитка' is in the genitive singular form, showing association with 'бутылка' ('bottle').