Bottled only - can't stand the taste of tap water - bleurgggggggggggggg
Never used the sticks so no idea really, except have seen other folks say that a deep colour might mean you are dehydrated - are you getting enough ;-)
I only love evian! Snob or what ha ha. I wouldn't worry too much about it being too purple as my mam always shows the darkest colour on the stick and she drinks sooooo much water everyday. As long as you know you are drinking the required amount and sticking to it i don't see a problem.