hands down, my nalgene bottles. I have 2 that are always near me. 1 always travels with me too. In the last year it made it to south korea, tanzania (up kilimanjaro) and to india. The only thing i didnt like is i had to replace my old one cuz of the bpa..i really liked the dark blue color!
I think it is great to be green for the environment but it is also important to be Green for personal well being! There are so many products out there that have harsh chemicals and after spraying them they leave you with a headache.
The Joy of Green Cleaning is a book that has great recipes for making your own products. With this you know what you are cleaning with and that there are no extra toxins being added.
Making my own cleaning products has been the best way for me to keep myself and my family healthy and green!
If I don's have time to make my own products though Mrs Meyers has to be one of my favorite brands.