No, not necessarily.
Water participates *a lot* in the actual chemistry your body does. It’s not around just to help the chemistry happen.
For example, your body may turn some of the glucose in your food into glycogen, which is a bunch of glucose molecules chained together more or less for storage. That process of chaining glucose molecules together ends up with water as one of its outputs. When you need to break glycogen apart, your body uses water to do it. The hydrogen and oxygen become part of the glucose molecules.
Reactions where water participates like this are all over your body. Your body is constantly making and using water. This leads to the amount of water entering and leaving your body not necessarily being equal over any length of time.
At an even more basic level, urine isn’t the only way water leaves your body, though.
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