Vitamin water only has just enough "vitamins" to qualify the title. There is not nearly as much in there as there is in a supplemental tab.
Not to mention, vitamin supplementation is rarely required (though sensible to take because there are no downsides in common dosages). Ditch the vitamin water, pick up daily supplemental multi vitamin, and perhaps some additional iron supplements and you'll be more than okay (and it's cheaper in the long run).
So, anyone recommend a good multivitamin? I don't eat a lot (low metabolism + thin) so it's actually hard for me to get a well rounded diet in a day. Planning on taking a multivitamin as a just incase. Already take vitamin D (50000 IU) once a month for a deficiency, but doctor said it'd be fine to take a multivitamin on top of that.
Supplements won't correct a serious deficiency in a persons diet. They're only meant to be a little extra in case you MIGHT be lacking. This goes for most supplements on the market.
Any multivitamin will do, really. Personally, I take AST 32x MultiPro. Though, most people won't be too happy with these vits as they're giant horse pills and it's recommended to take 2x a day (which is hugely in excess of most vitamins).
Take whatever's cheapest. In this case, it more than likely doesn't make a different.
Also, unless you have a GNC gold card, you're probably best just buying from a drug store, as the prices will usually be more forgiving.
Ultimately, as I've stated, it's hardly worth taking for the average person. If you're going to supplement anything (assuming you at least exercise occasionally), it would be preferable to take Creatine (I'm not going to get into a discussion about that. Actually, I might, but don't encourage me).
Eat good, feel good.