[Lilac]

Green tea is good, it's said to clean teeth and maby even kill harmfull bacteria and fungus. Black tea has also good things in it, but because it's processed I wouldn't recommend it.

I guess the harmfulnes of plain water, boiled or not, depends a lot about in what country one lives. Anyway the bottlewater isn't always better, nobody knows for how long it has been on the shelves and where did it come from the beginning...