"Water weight" varies from person to person.
It's recommended to drink at least 2 liters of water a day. But you void water from your body when you urinate.
You can lose it by becoming dehydrated, But you will always gain it back once you consume fluids. Being dehydrated is not healthy. Water weight is healthy, it helps keep your body functioning correctly.
i dont know how much of your body is water weight, but you cant get rid of water weight. you need water or fluids to live correct? without them you would die correct? so iveitably your going to put on the miniscule 2kgs or however much with all the fluids you drink, without it in your body you'll die. so unless you want to die, you cant