"I drink milk, and you drink water."
Translation:Saya minum susu, dan kamu minum air.
In English, meminum and minum are the same.
a) saya minum : I drink
b) saya meminum air itu : I drink that water
c) saya meminum air itu : I drink that water
However, both have a different functionality in case that
1). minum may be followed by an object or not
2). meminum must be followed by an object.
The meaning of that water in the above sentence may also different because we use meminum. It will be something like "unusual water."
Hope it will help.