When you're trying to decide whether to count something (as water, as a vegetable serving, etc), the key is to be clear in your own mind about why you're counting it. If you're counting water servings just to make sure you're sufficiently hydrated, then any liquid without alcohol or sugar would count. But if you're counting water as a way to teach yourself positive habits and self discipline, you might want to set stricter guidelines. I think unsweetened seltzer water would be okay either way, but coffee and tea would be up to you to decide.
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