This is the 219th most frequent Swedish word.
vatten
Water.
In this sentence, 'vatten' is used as a noun to refer to the substance water, highlighting its role in daily life as a part of a habitual activity.
Jag dricker vatten varje dag.
I drink water every day.
Here, 'vatten' is declined to 'vattnet' (definite form) to specify the water in question, identifying a particular water source in a natural setting.
Vattnet i sjön är kristallklart.
The water in the lake is crystal clear.
In this example, 'vatten' is part of a compound verb phrase 'vatten veka' presumably meaning to water something, demonstrating its verbal derivative use in a figurative sense connected to serving plants.