"I drink the water."
Translation:Jag dricker vattnet.
Both sentences are declarative as far as I understand the term, and while it may be common to see the indefinite form with the simple present, the other way around would also work. i.e. 'I am drinking water' would also be Jag dricker vatten and 'I drink the water' is also a possible sentence which would be Jag dricker vattnet.