This is the 766th most frequent Indonesian word.
mengisi
To fill.
Here, 'mengisi' is used to describe the action of filling bottles with a substance, in this case, water.
Kami mengisi botol dengan air untuk perjalanan.
We are filling bottles with water for the trip.
In this context, 'mengisi' is metaphorically used to express how something occupies or enriches one's time or experience.
Acara itu mengisi waktuku dengan banyak kebahagiaan.
The event filled my time with much happiness.
In this sentence, 'mengisi' refers to the act of filling out a form by providing the required information.